Best Inline UV Sterilizer For Aquarium | UV Sterilizers For Aquariums

Are you looking for the best inline UV sterilizers for aquariums to use with your Reef or Freshwater tank? This guide is designed to simplify the process for you.

Then, you’ll be taken through the process of how they do, it and how to pick the best inline UV sterilizer for aquariums to suit your needs.

Let’s get started-

List Of 10 Best inline uv sterilizers for aquariums:

Last update on 2024-06-08 / Affiliate links / Images from Amazon Product Advertising API

The Truth About UV Sterilizers In Aquariums

The majority of people are comfortable with equipment for UV sterilization. It uses UV light to kill undesirable bacteria or viruses as well as other microorganisms. What you may not realize is that you can utilize a UV light in your aquarium to ensure that the water is clear and free from algae and bacteria.

If you are looking to purchase the top UV sterilizer suitable for your aquarium, and not just one that claims to sterilize water, this guide may aid you. You may be wondering why it is important to make use of the best UV sterilizer to clean your tank.

Best Inline UV Sterilizer For Aquarium

Our top recommendation is the AquaUltraviolet Advantage 2000+ 15-watt UV Sterilizer.

The reason UV sterilizers work is the location they are placed in. They don’t directly emit light into the tank. Not only does this destroy all microorganisms, beneficial or not, but it also kills fish, plants, and other living things.

The majority of people install sterilizers alongside the filtering system. This allows the ultraviolet light to kill harmful bacteria that are usually found in the water. It will leave the beneficial bacteria to remain because they usually reside on the surface.

Best Inline UV Sterilizers for Aquariums: Reviews & Top Picks

AquaUltraviolet Advantage 2000+ 15-wattt UV Sterilizer

AquaUltraviolet Advantage 2000+ Inline 3/4" Barb - 15 Watt Aquarium UV Sterilizer
  • The Advantage Series is ideal for small ponds, aquariums and water...
  • A UV Sterilizer is a proven method to eradicate bacteria, viruses and...
  • Made in United States

Last update on 2024-06-08 / Affiliate links / Images from Amazon Product Advertising API

This potent sterilizer made by AquaUltraviolet is ideal for medium-sized tanks in which an inline UV sterilizer is preferred over hanging sterilizers.

The sterilizer is designed to handle flow rates of up to 240 gallons an hour or less. You can utilize your tank’s pump system to regulate the flow rate and dwell time to ensure greater complete sterilization. The sterilizer is suggested for tanks that are up to 75 gallons.

The device is small and light, with a 3-inch diameter that ensures that the entire water within the chamber gets efficiently absorbed by ultraviolet light. The tubing’s exterior is made with high-quality PVC plastic to ensure it’s tough.

Incorporating the sterilizer into the water system you have is incredibly simple due to the barb-style output and input but it’s important to keep in mind that the device doesn’t come with an installation tube or bracket.


  • Ideal for small aquariums, ponds, and water features
  • A high flow rate, which makes it perfect for tanks of 50 to 100 gallons or more
  • It functions as a complete device.
  • It cleans the water and kills harmful microorganisms
  • Easy maintain.
  • The water is circulated and aerated.


  • Expensive
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Fluval in Line UVC Clarifier

Fluval in Line UVC Clarifier for Aquarium Filters
  • A chemical-free and maintenance-free way to purify water that...
  • Helps prevent the growth of cyanobacteria that often smothers and...
  • CCFL (Cold Cathode Fluorescent Light) technology runs cooler than...
  • Quickly connects in-line to all canister filter hosing with an...
  • For use in freshwater, saltwater and even turtle aquariums where algae...

Last update on 2024-06-08 / Affiliate links / Images from Amazon Product Advertising API

My aquarium was plagued by a serious problem with algae and bacterial blooms prior to the time I tried this product. It was so severe that even water changes didn’t make the water look slightly clear.

I tested the UV water sterilizer, and within a single day, I observed an enormous improvement in the water quality. After about a week of using this UV lamp for a few hours per day, my water was pure.

In addition to the dreaded bacteria that make the water cloudy, this product stops the growth and spreading of the deadly Cyanobacteria. I owned a tank that ended up being severely affected by Cyanobacteria. Thankfully the product was able to fix the problem before all of the fish and plants perished.

I have a filtration system called Fluval inside my tank therefore the installation of this UV sterilizer inline aquarium to fit in was a challenge. Its outlet is exactly the same in size as the intake to the UV sterilizer. Therefore, I did not make any adjustments. Installation was simple. I like the fact that this gadget can be easily concealed inside the cabinet for aquariums.

It is believed that the UV lamp will last for a minimum of thirty-five hours of use. If this is true then you’ll be using this top micro UV sterilizer for an extremely long period. The time I utilize mine is approximately 2 hours each day for maintenance. If it lasts for 30,000 hours, it means I could utilize the UV sterilizer for around 27 years.

It would be wonderful to see this UV sterilizer for aquariums that could last for more than thirty years. However, we are aware that this won’t ever happen. The issue is that if the bulb is damaged in any way the bulb cannot be replaced because it’s sealed and can’t be removed. It is necessary to purchase an alternative bulb in the event that an element is damaged.


  • Effectively kills bacteria and algae in the water column.
  • Stops the spread and growth of deadly Cyanobacteria
  • Can easily be connected to the Fluval canister systems.
  • The UV bulb is said to last for 30 years.
  • Tank water is kept clean and free of the use of chemicals


  • It is a fully sealed system that doesn’t permit bulb replacement

This top submersible UV sterilizer is supposed to be simple to set up for every Fluval system, however, it is only compatible with those in the 06 and 07 series. If you don’t own any of these models, you’ll have to purchase extra fittings for this UV sterilizer to perform for you.

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5W UVC Aquarium Clean Lights

5W UVC Aquarium Green Clean Light Algae Clear Fish Tank Water Clean Lamp Submersible for Swim Pools Pond Fish Tank Filter Pump
  • 【 Application 】this water clean light help to clean the green...
  • 【 WARNING 】Please use the light in sump or filte r tank,please DO...
  • 【Instruction 】Provide a clean living environment for your...
  • 【 Lamp feature】5watt 6.9inch x 0.82inch,110 voltage...
  • 【 Warm Tips 】Promise to respond within 12 hours, if you found any...

Last update on 2024-06-08 / Affiliate links / Images from Amazon Product Advertising API

One of the things I like about this gadget is that it does not require any type of installation. There is a sump unit fitted in one of the tanks and I positioned this lamp in one compartment, which is two places away from the biofilter. I am able to say that it functions as I expected.

You can’t tell how strong this UV sterilizer for aquariums with planted plants can be by just taking a look and observing it, but trust me when I tell you this is a hardy UV lamp. Its glass enclosure is extremely thick and it will take an extremely hard blow to break it. I haven’t had any problems dropping mine and yet, just by being in the palm of my hand I can tell it’s very durable.

The UV light is extremely effective. It was able to clear my water in only two days. I fed my fish too much one time, and it ended in a severe outbreak of bacterial bloom. Water changes of even a small amount didn’t aid. I attempted this as a last-ditch attempt before attempting chemical techniques and it worked quite a bit.

Another great feature of the UV sterilizer is its installation is as simple as sticking the suction cups to any glass in the filter or sump. There is no need to install plumbing or similar. Just place the lamp on the wall on the wall, plug it in, and then turn on the light.

Now, the issue with this particular device is the results may differ from those of other users. I’ve used it in 2 tanks, and the rate of clearing the water up is different. Don’t count on the algae blooms or bacterial growth to disappear as quickly as some UV sterilizers for fish reviews claim. But I do know that it works with certainty.


  • Submersibles are suitable for the majority of sump systems.
  • Robust construction. This means it won’t break easily.
  • Effectively kills algae and bacteria without using chemical
  • It is easy to install and includes suction cups as well as brackets
  • It is suitable for freshwater as well as saltwater aquariums


  • The results may differ, however, you should still be able to be sure of water clarity overall.

One thing you should be aware of is that any of the UV lights leak out. In particular, you should avoid exposing your tank directly to ultraviolet light. You must have a filtration system with an area where you can put this device.

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SunSun Hw303B Canister UV Sterilizer Filter

SunSun Hw303B 370GPH Pro Canister Filter Kit with 9-watt UV Sterilizer
  • HW-303B Pro Filtration Kit, Good for up to 100 gallon aquariums
  • Flow rate: 370 GPH (1400L/Hr)
  • Dimension: 10.5" L X 10.5" W X 16" H
  • Pro Kit Includes Canister Filter w/9 Watt UV, 3 White Filter Pads, 1...
  • Includes 1lb of Premium Filter Carbon, 1lb of Ceramic Rings and 1 Set...

Last update on 2024-06-09 / Affiliate links / Images from Amazon Product Advertising API

The greatest aspect of the SunSun filter kit is the fact that it’s the only item you’ll need to keep your tank free of dirt and debris. The best UV filter is a biological filter, a mechanical filter, and a UV sterilizer in one unit.

I have one to keep a 70-gallon tank in good condition. Another one is located in my garden to keep the koi pond a smaller size. It serves a variety of purposes, even though you don’t have a pond. SunSun UV sterilizer isn’t so large. It can hold lots of filter media.

If you purchase the canister, it’ll include a pound of carbon filtering as well as an ounce of ceramic rings as well as an assortment of bio balls. Additionally, there are many filters. This means even the tiniest bit of dirt won’t be able to pass through.

What I like the most about this filter is the fact that it comes with an ultraviolet lamp built-in. This lets the filter not only remove solid waste from the water as well as remove floating germs and bad bacteria. I switch off the ultraviolet light a few hours each day when the tank starts to appear cloudy as a result of algae or bacteria blooms.

This filter is attached to a 70-gallon tank, however, it is capable of handling the 100-gallon tank in the event of need. It has an engine that can handle a 370GPH flow rate. This lets the water circulate and be oxygenated and results in healthier fish.

In addition to being costly, which is a matter of opinion, however, there’s no reason to be unhappy with this freshwater aquarium that is UV sterilized. Since I began using this equipment, my aquarium has been always clean and free of algae. Fish and other aquatic animals are all happy and healthy. If this filter ever fails, I’ll certainly purchase another.


  • All-in-one filtering system.
  • The capacity to hold a large amount of filter media
  • It comes with a UV light sterilizer
  • Free bags of filter media.
  • Are suitable for aquariums up to 100 Gallons


  • There’s not much to dislike. this is among the finest canister filters you can ever come across.

While this canister filter is costly it’s an investment worth it for you. Apart from the fact that it excels at removing water, it’s also extremely robust. I’ve read lots of reviews that claim their devices last for years without needing repairs.

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Coralife BioCube UV Sterilizer

Coralife BioCube Aquarium Fish Tank UV Water Sterilizer with 5 Watt Lamp For All Sizes
  • Aids in eliminating harmful parasites, bacteria and free floating...
  • Uses Coralife 5W Replacement Ultraviolet Lamp
  • Fits in BioCube Aquariums
  • Designed for attachment to the existing BioCube pump for easy set-up...

Last update on 2024-06-08 / Affiliate links / Images from Amazon Product Advertising API

It is, as the name suggests this is a smaller UV sterilizer tank, which makes it perfect within small aquariums, such as the BioCube. The sterilizer has five watts of UV light which may appear small. But it’s enough for smaller aquariums. Anything larger than that will seem like overkill.

One of the advantages of the sterilizer you can use is it’s not technically exclusive to BioCube. You can utilize this device regardless of whether you have another model of filter or tank system. It comes with a universal adapter as well as additional tubing pieces that allow it to fit into any water pump you might use.

The kit includes an extremely long-lasting five-watt ultraviolet bulb. Apart from being able to last a longer time, it’s great to quickly replace the bulb in the event that it is damaged or even burns out because you did not shut off the light when you allowed it to go on for a whole day.

I am extremely satisfied with this product because since I began making use of it, I have not yet encountered any bacteria or blooms of algae. It has also eliminated all harmful parasites and keeps my fish and plants in good health.

Although it’s possible to simply replace the burned-out or damaged bulb, it’s more economical to buy an additional unit. The replacement bulbs are difficult to locate, and they cost about the same as a brand-new UV sterilizer instead of trying to salvage the older one.


  • The small size makes it ideal for small aquariums.
  • The product comes with a universal adapter, so it will work with other brands.
  • With a long-lasting LED that you can change if you need to
  • Installation is simple and easy to do
  • Effectively kills algae, bacteria, and parasites that are present in the water.


  • Replacement bulbs cost about the same price as new bulbs.

Even if you don’t have a BioCube aquarium You can still make use of this filter attachment because of the universal adapter as well as additional pieces of hose. However, it is unfortunate that replacement bulbs cost nearly the same amount as the entire package.

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GRECH CBG-800 UV Sterilizer

Grech CBG-800 5W UV Sterilizer Hang-On Back Filter, 20-50 gallon/211 GPH, Black
  • Adjustable 211gph Filter Flow Rate with Surface Skimmer to eliminate...
  • Features a 5W UV Sterilizer. Helps eliminate algae and bacteria,...
  • Suitable Aquarium Tank Size: 20 to 50 Gallons
  • Dimension: 9 x 5 x 7in (229 x 127.5 x 179mm)
  • Biological and mechanical filtration. Box includes active carbon and...

Last update on 2024-06-08 / Affiliate links / Images from Amazon Product Advertising API

It is great for 20 to 50-gallon aquariums, however, it could also be used on smaller tanks, up to 15 gallons, I believe. I have this filter on a 20-gallon tank, and I love its small design.

Another thing I like about it is that it comes with a UV light built-in. The HOB has 5-watt UV light which is strong enough to ensure that it is able to kill a majority of the harmful algae spores bacteria and parasites floating within the waters.

I also loved that you can alter the parameters of this filter in any way you’d like. I have a tank that holds 20 gallons and I have to lower the flow rate to a minimum level due to the fact that the pump stirs up the water excessively. The ability to telescope the intake of water is also an advantage. I set mine to be at the bottom, which helps to minimize the disturbance caused by water.

The filter also has an adsorption skimmer that can be useful when you are using a water conditioner with aloe. Though I do not often utilize these features in my aquariums since the surface film is rare in freshwater aquariums, it’s good to know it’s available if I ever require it.

The creators were so determined to improve this device that it turned out to be complex. For instance, if require cleaning the filter, you’ll have to take out the entire basket. It is then necessary to remove the filter media with care. After cleaning them, it is important to make sure they are perfectly aligned or else the bag won’t go back to its housing.


  • Has a compact design
  • Have all your filtration requirements taken care of
  • It comes with a built-in UV lamp of 5 watts.
  • The adjustable flow rate can be adjusted as well as the telescoping inlet tube
  • It has a surface skimmer.


  • The design is over-engineered, making it hard to maintain

While this filter is difficult to maintain, the filter performs effectively in eliminating harmful substances from the water. The built-in UV light prevented algae from growing as well as bacterial bloom. This is a great recommendation item for anyone who has an aquarium.

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Polar Aurora Canister UV Sterilizer Filter

Polar Aurora Free Media 3-Stage External Canister Filter with 9-watt UV Sterilizer for Aquarium 265 GPH Builtin Pump Kit Canister
  • Canister filters for aquariums use high water pressure, from a...
  • 3 media trays capable of handling your choice of filtration media;...
  • Convenient self-priming pump that eliminates the need for manual...
  • Provides quiet, efficient filtration for fresh and saltwater aquariums...

Last update on 2024-06-08 / Affiliate links / Images from Amazon Product Advertising API

For such a large and powerful canister filter I was awestruck at the size of it when I first saw it. The base measures just 9″ by 9″, making it easy to put in an aquarium’s cabinet. But don’t be deceived by the dimensions. It’s capable of circulating water within tanks of 75-gallon capacity efficiently.

I also loved I also appreciated that Polar Aurora already has all the filters this canister filter will require to begin. The kit includes two small and large sponge filters. Also included are a one-pound pack of activated carbon and a pound ceramic rings, as well as 40 bio balls.

Another feature of this product I enjoyed quite often is its silence. When I first tried this filter cartridge I was convinced that I had an item that was defective because, aside from the indicator light I could not determine if it was operating. It was so it was quiet. The aquarium was inside the family room and having a quieter filter was crucial to me.

The light source is powerful in that it instantly kills algae spores and bacteria present in the waters. I tried this filtering system for canisters in the tank, which was suffering from severe algae bloom. It was so dark green that it was difficult to see what was on the opposite side.

After the filter was used for about 3 days, working 3 to 4 hours per day, the water became more clear and the green color disappeared.

I’m not unhappy with the way it works However, I would like that the fittings made of plastic were more durable. I accidentally smashed one bolt that held the hose inlet inside the tank. Finding an alternative was difficult. I put an aquarium-safe glue and hoped it would stay in place.


  • A compact product that barely takes up a square inch of space
  • Filter media is included.
  • It operates quietly and with no obvious vibrations
  • It has a powerful 9-watt UV bulb
  • It has a decent flow rate. It’s strong enough to support a tank of that is 75 gallons or more


  • The plastic fittings are thin and fragile.

There’s nothing to complain about with this water-filtering canister. It is equipped with an adequate flow rate, a huge capacity for filtering media, and an extremely powerful UV lamp that kills any unwanted microorganism within a matter of seconds.

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TAISHAN UV Sanitizer Submersible Light

TAISHAN Aquarium Clean Light,3W Mini UV Sanitizer Submersible Light with Timer,Aquarium Water Clean Green Clear Waterproof Clean Lamp for Pond,Swimming Pool,Indoor
  • 🐟Strong Sterilization:Fish tank disinfection lamp can kill up to...
  • 🐟Quick Disinfection:254nm wavelength light help to remove the...
  • 🐟Easy to Operate:Press the button to control the light,updated...
  • 🐟Superior Silica Glass:Glass products, handle with care, do not...
  • 🐟Warm Notice:Please measure the size of your aquarium and compare...

Last update on 2024-06-08 / Affiliate links / Images from Amazon Product Advertising API

Is Taishan Submersible UV Light Bulb designed for aquariums is one of the most compact UV sterilizers I’ve tested to date. It’s compact enough to be placed in a HOB designed for tanks ranging from 20 to 30 gallons. It is best to place the light in the area that is farthest from your biofilter, that is in the event that it already has one.

Apart from its tiny dimensions, this small device also includes suction cups and a bracket. This means you can put this device in a secure position on the walls of your chamber for water filtering. Be sure to secure this device because its glass enclosure is extremely fragile.

Another thing I like about this UV sterilizer aquarium is that it has an inbuilt timer. I loved it because I could switch on the light and set the timer to one hour and it would shut off by itself. This is different from other UV lamps I’ve utilized where I had set a timer that will remind me to switch off the light.

The most appealing aspect of this UV sterilizer I believe is the fact that it makes use of the UV-C light. It’s much more efficient in killing harmful microorganisms. Contrary to other UV lights which required to remain on for several hours each day the UV-C light I used needed 30 minutes every day to achieve a significant improvement in the clarity of the water.

There is nothing I can complain about in the way the device worked. But, if I have to mention even one minor flaw this would be the manuals that came in the box were difficult to understand since the instructions were in severely broken English.

If you’ve had issues with algae blooms or bacteria it is time to look into this simple device. This light is small enough to transform my infested algae tank into one that was transparent in just an entire week.

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OXYFUL UV Ultraviolet Clarifier Lamp Filter

OXYFUL 36W Non-Submersible UV Ultraviolet 21.5" Light Clarifier Lamp Filter for Aquarium Koi Pond Fish Tank
  • STABILIZE YOUR ECOSYSTEM - Removes the toughest grime in your...
  • PROTECT YOUR FISH - The High-performance UV bulb ensures professional...
  • MAX FLOW RATE - 1,849 GPH 36W UV bulb. Perfect for tank or pond sizes...
  • LONG LASTING UV BULB - Life of UV bulb effective up to 1 year. UV bulb...
  • SPECIFICATIONS - 38w power consumption 36w UV bulb 22"L x 6.5"W x...

Last update on 2024-06-08 / Affiliate links / Images from Amazon Product Advertising API

One thing I like about this sterilizer UV is that it will not affect the current filter configuration. It was a long time before I was aware of UV sterilizers and the ways they help prevent algae blooms. It was great to know that I can just put this to complement my filter system and that I don’t need to change everything.

Another advantage of this particular brand is the fact that it can be used on any filter system you own. It comes with a variety of adaptors to be used on any rubber hose that you might be using. It is also possible to set it in any location you like. The cabinet in my aquarium is already quite cramped, so I needed to put the device vertically, and it worked.

This filter attachment also has the capacity to be able to handle quite a bit of pressure. I have a huge 100-gallon tank. Therefore, the water pump has to be extremely strong, as well. The pump has a capacity of 792 gallons/hour, which means that the power of the pump wasn’t an issue at all.

Additionally, even the water flows through the device at a high rate The included 18-watt UV light will ensure that all traces of algae, bacteria, and other harmful substances will disappear once they’re exposed to UV light. I haven’t seen any algae blooms since beginning to make use of this gadget, and I’m sure you won’t either.

The device performed well for me, however, I did experience a small issue with the O-rings that came with it. The ones I received were extremely weak and brittle Two of them broke in half and others started to leak. It’s a good thing the manufacturer was able to provide me with a large number of O-rings spare when I emailed them explaining my problem.


  • It is installed in conjunction with the tank’s filter system.
  • There are a lot of fittings to fit all sizes of hose
  • Can manage high flow rates?
  • It has a powerful 18-watt UV bulb
  • Assures clarity of water and good ensures health


  • The O-rings aren’t durable and are not flexible enough.

The only issue I have with the UV water sterilizer is the fact that it is made of weak O-rings. This wouldn’t be a problem if the components were readily available. Fortunately, the manufacturer offers outstanding customer service and aftermarket support. I strongly would recommend the UV filter to any aquarium that has an aquarium sump.

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SunSun HW-304B External Canister Filter

SunSun HW-304B 5-Stage External Canister Filter with 9W UV Sterilizer, 525 GPH
  • Good for up to 150 gallon fish tanks
  • Dimension: 11" L X 11" W X 17" H
  • Flow rate: 525 GPH (2000L/hr.)
  • Built in 9 Watt UV sterilizer for controlling algae spores/bacteria...

Last update on 2024-06-08 / Affiliate links / Images from Amazon Product Advertising API

If you own a huge aquarium, such as one that is more than 100 gallons, consider purchasing this canister filter to complement your aquarium. The filter comes with a water pump capable of 525 gallons per hour, and it did not have any issues with the circulation of water in the 150-gallon tank. I set the intake pipe at a low level close to the substrate in order to ensure that the water flows in a proper manner.

This canister filter has five stages of filtering, which means you can be sure it will remove nearly every piece of debris that is floating around in the water. This keeps the water crystal clear and lowers the risk of nitrate and ammonia spikes within the water. Even though the water is clean and clear, I make it a habit to test it each week. So do you.

In addition to these solid particles, this canister filter includes a powerful ultraviolet lamp that can kill 9 watts of microorganisms that cause harm to the human body floating within the waters. If you’re struggling to have green water because of algae blooms and you want to get rid of it, consider this item.

In a device that is able to circulate water at a fast rate, I was amazed by how quietly this filter operated. Even in my peaceful living space, and when the cabinet door is open, it is difficult to hear the water pump running, apart from the soft dripping of the water inside the tank. Its sound disappears when I shut the door to my cabinet.

I love this filter very much however I’d have loved it more if the manual included with the gadget was well-written. It was great that the manual had illustrations since they were in broken English and were difficult to comprehend.


  • It has an extremely high flow rate
  • Small size, which makes it easy to store away
  • Quiet operation
  • It comes with an integrated 9-watt UV light
  • Comes with all the media required to start


  • Instructions that are difficult to comprehend.

Like its smaller version, the canister filter can also transfer a considerable amount of water despite its tiny size. If you own an aquarium that is less than 55 gallons I would suggest choosing the smaller model over this model. This could be too big for a tiny tank.

What to Look For When Buying UV Sterilizers For Aquariums

Best UV Sterilizers For Aquariums

What size UV sterilizer do I need for my aquarium?

The chart below offers guidelines to determine the bulb’s size and flow rate that you need to sterilize your UV light. For this chart, determine the maximum gph rate in either column that closely matches the number of gallons you have in your aquarium. The flow rate that is the maximum should be greater than the total number of gallons within the system (tank and sump).

For instance, if you have a 100-gallon tank, and are looking to eliminate parasites, you’ll require a minimum 18-watt UV and a max flow speed of 100gph. A 25-watt UV operating at 150 gph is ideal. When it comes to UV sterilizers, bigger is more effective.

Maximum Flow Rate for Controlling:
UV Bulb (Watts)Bacteria and AlgaeParasitesAquarium Size
8120 gphN/Aunder 75 gallons
15230 gph75 gph75 gallons
18300 gph100 gph100 gallons
25475 gph150 gph150 gallons
30525 gph175 gph175 gallons
40940 gph300 gph300 gallons
651700 gph570 gph570 gallons
801885 gph625 gph625 gallons
1203200 gph900 gph900 gallons
1303400 gph1140 gph1140 gallons

There are a variety of brands of UV sterilizers for aquariums available on the market However, not all of them function in the same manner. Some do not even function. To ensure that you don’t end up spending your money and time on products that aren’t working Here are some things to be aware of when buying UV sterilizers for aquariums.

Strength of the UV Lamp

It will be based on the speed of flow from your water source. If you have a high flow rate, then you’ll need more power from your bulb. I recommend anything that is 9 watts or more. This is usually the case if you own large tanks. However, it is not the case if you just have smaller tanks, like one that is a 15- or 10-gallon aquarium, a 3-watt bulb is sufficient.

Built-in or Needs Installation

If you are planning to start your first tank, think about buying a filtration unit with an integrated UV lamp. It will help you save a lot of space and time. However, it is a good idea to have a filtering system then you could consider one of these UV lamps that are submersible or are installed in conjunction with your filtering system.

Ease of Use

The UV lamps built into the system are the easiest to work with. They are mainly because they do not require you to place them in a way that won’t harm the bacteria inside the biofilter and will continue processing the water that is going into the filter. However, many filters that have integrated UV lamps don’t come with timers like lamps that are submersible.


If you are on a small budget and can’t afford to replace your whole filtration system to get the UV sterilizing capability and you’re looking for an inline or submersible UV lamp. It will work similarly, however, without the cost.


Do UV sterilizers actually work for aquariums?

Can UV sterilizers be used in any aquarium? Yes, whether salt or freshwater coldwater, tropical or marine, from guppies to goldfish and Discus as well as clownfish. UV sterilizers can be utilized in all kinds of aquariums. It can also benefit the clarity of the water and the overall health of the fish.

Should I run my UV sterilizer all the time?

An aquarium UV sterilizer must be turned on and running all day long all day. There are exceptions to this, such as making the tank ready prior to putting any fish present, or giving beneficial bacteria to your water, since ultraviolet light destroys bacteria or if you’re taking a medication that states that UV lights must be shut off.

Do you put UV sterilizer before or after filter aquariums?

The ideal location to install the Aqua Ultraviolet Sterilizer would be after the filter has been installed. If a follow-up installation after the filter isn’t feasible it is possible to have your sterilizer installed prior to the filter, however, it may take longer to start working.

How long does it take a UV sterilizer to clear green water?

If properly installed, Aqua Ultraviolet guarantees your aquascape will disappear within 3 to 5 days when making use of the equipment. You should consider this device for ponds that require minimal maintenance, or if you suffer from a murky, green pond or the pond is subject to direct sunlight or warmer temperatures.

Conclusion: Best Inline UV Sterilizers For Aquariums

When you are trying to find the best inline UV sterilizers for aquariums that can be used for a moderately-sized tank, and for the removal of common viruses and bacteria, we recommend the AquaUltraviolet Advantage 2000+ 15-watt UV Sterilizer.

The CCFL (Cold Cathode Fluorescent Light) technology operates more efficiently than conventional UVC bulbs, allowing them to last for as long as 3000 minutes (3X longer)

These inline UV sterilizers for fish tanks are suitable for aquariums and are a quick and easy connection to any canister filter hosings with an inner dimension that is 5/8″ (or 16 millimeters) which includes the Fluval 06 and 07 Series filters. not compatible in conjunction with the Fluval FX Series

The best part is that the barb-style outlet and inlet ports make the process of installing the sterilizer and taking it out for cleaning simple.

Sometimes mechanical filtration might not be sufficient to ensure that your tank is sparkling and clean. No matter how many stages of filtration the water in your aquarium passes through it is likely that algae and bacteria continue to pass through them.

If you’re looking to have clean, healthy, and safe water for your tank and the fish that live there then you’ll need the most effective UV sterilizer for your aquarium available. With this unit, you no longer require harsh chemicals to clean the tank’s water. The UV light can do the job for you by itself.

Dibyajyoti Bordoloi is the creator and author of, a third-generation experienced fish keeper and owner of a successful pet breeding farm. He is also a member of the Center for Wildlife Rehabilitation And Conservation (Assam), the Marine Aquarium Societies of North East India, and the Kaziranga Nature Conservancy of Assam.