40 Gallon Breeder Tank Dimensions

40 gallon breeder tank dimensions are specific and different from others. The base of other regular 40 gallon tanks is more rectangular. However, the bottom of breeder tanks is more square.

These tanks are specially designed for breeders with a view to easily access their fish because of the lower profile.

You may wonder why anyone would want to own a 40 breeder if it’s an option for you and what type of fish you are able to keep in the 40-gallon breeder tank.

Let’s first check out a few of the dimensions!

40 gallon breeder tank dimensions

Some rough guidelines are provided by our aquarium experts below as to what to expect when looking at different aquariums and full vs. empty weight.

The aquarium weights are simply an estimate due to the type of water, the thickness of glass, and the amount of rock all affect the calculations of weight.

If we measure a gallon of fresh water at a particular gravity of 1.000 weighs 8.34lbs. 1-gallon water 8.34lbs times the particular gravity of say 1.025 equals 8.5485lbs (8.43 x 1.025 = 8.5485).

The weight of the water will increase in direct proportion to the weight of the salt which is dissolved in the water. 1 gallon saltwater at 1.025 is equal to 8.54 lbs.

What is the length and width of a 40 gallon tank?

Aquariums are available in many sizes. It starts from as small as 2.5 gallons to as large as 180 gallons or more.

Tank SizeL x W x HEmpty WeightFilled Weight
2 1/2 gallon12″ x 6″ x 8″3 lbs27 lbs
5 gallon16″ x 8″ x 10″7 lbs62 lbs
10 gallon “Leader”20″ x 10″ x 12″11 lbs111 lbs
15 gallon24″ x 12″ x 12″21 lbs170 lbs
15 gallon High20″ x 10″ x 18″22 lbs170 lbs

Tank SizeL x W x HEmpty WeightFilled Weight
20 gallon High24″ x 12″ x 16″25 lbs225 lbs
20 gallon Long30″ x 12″ x 12″25 lbs225 lbs
25 gallon24″ x 12″ x 20″32 lbs282 lbs
29 gallon30″ x 12″ x 18″40 lbs330 lbs
30-gallon Breeder36″ x 18″ x 12″48 lbs348 lbs
40-gallon Breeder36″ x 18″ x 16″58 lbs458 lbs
40 gallon Long48″ x 12″ x 16″55 lbs455 lbs

Tank SizeL x W x HEmpty WeightFilled Weight
50 gallon36″ x 18″ x 19″100 lbs600 lbs
55 gallon48″ x 13″ x 21″78 lbs625 lbs
65 gallon36″ x 18″ x 24″126 lbs772 lbs
75 gallon48″ x 18″ x 21″140 lbs850 lbs
90 gallon48″ x 18″ x 24″160 lbs1050 lbs
125 gallon72″ x 18″ x 21″206 lbs1206 lbs
150 gallon72″ x 18″ x 28″338 lbs1838 lbs
180 Gallon72″ x 24″ x 25″430 lbs1870 lbs
225 Gallon72″ x 27.5″ x 27.5″358 lbs2158 lbs
A table containing various tank dimensions

40 gallon breeder tank dimensions compared to other 40 gallon tanks

If someone is thinking about a 40-gallon breeder tank, they’re thinking about a tank that is about 16” high and not that wide. The exact measurements of this type of tank might differ depending on what manufacturer you’re searching for.

Look carefully at the image below, the height of 40 Breeders and 40 Long are equal.

However, when you’re handling fish then the 40 Breeder is actually more convenient. When your fish are fast and agile catching them in a long tank can be a struggle.

Apart from these three varieties, there’s also a tank known as 40 Cube. All the sides of the 40 Cube are around 20 ¾ “ to end up with 40-gallon tanks. To adjust the layout of your tank and to handle fish, the lower profile of a 40-gallon breeder tank makes it convenient for the fishkeeper.

One of the major reasons why these dimensions are known as a breeder tank is the ease of catching fish.

Why would you want a 40 breeder aquarium?

Having a 40 Breeder tank has a lot of benefits. The bigger footprint in combination with the low height makes it easy to handle, fry, and catch fish.

However, there are a lot of people among us who own 40 Breeder tanks without any intention to breed any kind of fish. Because this has a lot of other benefits.

Firstly, if you look at the front of your aquarium, the tank seems very deep. Roughly you have got 18” of space to fill with ornaments, rocks, wood, or plants. This is much more than the average 12” of the area you have got with any “regular” 40-gallon tank.

You can get creative in a true sense. The space offers sufficient room for various layers, pieces of driftwood, or larger rocks, or additional interest.

Due to this reason, 40 breeders are highly popular among aquascapers or fish keepers. Aquascapers are those creative people who create beautiful and attractive aquarium landscapes underwater.

Are breeder tanks good for turtles?

Also, there is another group of people who are very happy with 40 gallon breeder tank dimensions turtle keepers.

I’ve recently got 5 musk turtles myself, but these varieties of turtles aren’t the best swimmers. Alternatively, they like to walk on the bottom of the aquarium and occasionally swim up for air.

It gets harder for your turtles to swim up with a very tall aquarium. This is the reason why so many turtle keepers prefer a lower tank height.


Where Can I Buy a Breeder Tank?

You can buy a breeder tank from fish stores as well as online through the same fish stores or platforms like Amazon. You can also buy these tanks locally on the local used pet supply pages.

What’s the difference between a 40 gallon and a 40 gallon breeder?

The main difference between a regular tank and a breeder tank that contains the exact amount of gallons of water is the regular tanks are taller.

Breeder tanks are built to provide a lot of surface area, so it is lower profile than a regular tank.

What size is a 40 gallon breeder tank?

40 gallon breeder tank dimensions:

Tank SizeL x W x HEmpty WeightFilled Weight
40-gallon Breeder36″ x 18″ x 16″58 lbs458 lbs
(40 gallon breeder tank dimensions)

Dibyajyoti Bordoloi is the creator and author of FishCampRehab.com, 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.

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