Best Quality 40-Gallon Fish Tanks Available In The Market

Fish keeping is not an easy task. It demands a lot of patience and continuous hard work. The skills needed to understand what is best for the fish, under what conditions they tend to reproduce and how to maintain an optimal environment for them, can only be learnt with time.

For this purpose, purchasing the right size of fish tank plays an important role.

40-gallon fish tanks are the optimal sized aquariums for both experienced aquarists and the newbie.

You can put a variety of fish in these aquariums which makes them the perfect fit for everyone. From marine to freshwater fish species, it can accommodate a lot of them.

Obviously you do not need a 40-gallon aquarium to breed small fish but the more space they have, the more good is for them to thrive.

In this size of fish tank, you can breed a wide range of species including well-known tropical and reef species. But the most popular option of fish species for this size, are the large ones.

It provides a lot of space for breeding Guppies, Bettas, Clownfish, Plecos or Cichlids. Apart from that, it provides an ideal environment for invertebrates like Ghost, Amano and Cherry Shrimps.


Aqueon 40-Gallon Breeder Tank

Aqueon Tank Breeder Black 36X18X16 40gal
  • Brand New Un-Opened

Last update on 2022-03-21 / Affiliate links / Images from Amazon Product Advertising API

Aqueon is a famous brand within the aquarium industry. This company produces a wide variety of aquariums of different types and sizes.

This Aqueon Breeder Tank is perfect for all kinds of aquarists, from beginner to experienced. It is made of high-quality material which makes it unbreakable.

It is solid and sturdy, with smooth silicone edges to prevent leakage.

Fish tanks that are unbreakable are the best picks otherwise, the lives of aquatic animals might get in danger. So it is best to take precautions and invest in a quality material.

This fish tank is available in black and trim oak. It is built with a brace across the middle of the aquarium so as to prevent the glass from bowing.


  • Its dimensions are 36*18*16 inches.
  • Provides convenience in altering water level for breeding.
  • Available in either black or oak trim.
  • Made of high-quality material

SeaClear 40-Gallon Acrylic Aquarium

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This SeaClear Acrylic Aquarium is made from acrylic which makes it stronger, lighter and clearer than the glass ones.

It is not prone to breakage that is why it is safe to keep in a house with children. Moreover, it is more impact resistant and much likely to crack or chip than its counterpart glass tank.

All these features make this aquarium the perfect fit for breeding which require constant monitoring and checking.

This aquarium can be used for both saltwater and freshwater setups. It comes with a reflector and a 24-inch light fixture.

The best thing about this model is its warranty which is probably the most expensive warranty in the industry. Some of its models even come with a lifetime warranty.


  • It measures 36*15*16 inches.
  • Suitable for saltwater and freshwater setups.
  • Comes with a reflector and a 24-inch light fixture.
  • Made of high-quality material
  • Comes with an extensive warranty
  • Comes with three different backgrounds
  • Acrylic is stronger, lighter and more impact resistant than glass.
  • Corners are seamless which makes visibility for breeding easier.

SeaClear System II Bow Front Acrylic Tank

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The brand SeaClear is one of the most reputable brands in the aquarium industry. You can always go for their products without even thinking twice.

This model of the series is a bow-front fish tank which makes it slightly larger than the regular breeder tank.

This model is convex in shape which enhances the view of the marine life inside and making it easier to keep a close eye on breeding, eggs and fry.

It can be used for both saltwater and freshwater setups. Moreover, it has invisible seams only adding to the already perfect view you have of the fish.


  • Unique bow-front design
  • Seamless corners make viewing easy
  • Ideal for breeding
  • Less likely to break or chip than a glass tank
  • Acrylic holds the water temperature better than glass.

SeaClear Junior Executive 40-Gallon Rectangular Acrylic Aquarium

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SeaClear brand’s aquariums are one of the most reputable ones in the market. They are known for their high-quality material and warranty.

They come in various sizes and shapes so that you have plenty to pick from.

This 40-gallon fish tank is perfect for saltwater as well as freshwater setups. It is rectangular in shape and is made of acrylic.

The material makes this aquarium highly durable and resistant to breakage. The best thing about it is that it is available in three background colors - clear, black and cobalt blue.

Constructed with the finest acrylic and years of dependable service, this aquarium is ideal for beginners.

It is no doubt, 17 times stronger than glass and other commonly used aquarium materials. Its seams are molecularly bonded and heat polished, not joined with glue or sealers.

It means that your aquarium will be virtually leak and break proof.


  • No degradable sealer is used
  • Made of the finest acrylic available
  • Offers years of warranty and service
  • Leak proof and break proof
  • Electrically approved
  • Easy and safe to ensemble
  • Impervious to the corrosive effects of saltwater
  • It measures 36*15*16 (length, width and height).

Clear-For-Life Rectangle Acrylic Aquarium AA040RC

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Clear-for-life – this brand might not have introduced many of its models in the market, but the ones that have been, are no doubt innovative and excellent.

Measuring 40-gallons with 36 inches length, 15 inches width and 16 inches height, this fish tank is rectangular in shape.

It is made of acrylic material which makes it resistant to breakage and scratches. Also, it is safe to keep around children.

With this model, you have four backgrounds to choose from - clear, black, blue and sapphire. So you have several to choose from.


  • It measures 36*15*16 inches
  • Made of acrylic
  • High-quality material is used
  • Available in four backgrounds
  • Rectangular in shape


It is also perfect if you want to keep a large number of small ones. The bottom line is that this size is suitable for everyone, for the experienced as well as for beginners.

So if you want to take up the fish-keeping hobby, I would suggest you to go for this size.

As I have already mentioned, 40-gallon fish tanks are perfect if you want to keep large-sized fish.

I have mentioned the best five 40-gallon aquariums in the market right now, along with their features. Everything has been mentioned in detail so that you have ease in buying.

The most amazing feature of the Aqueon Breeder Fish Tank is its high-quality built, which makes it the best pick for beginners, as they might face difficulty in the beginning.

Then comes three SeaClear Aquarium models which have all the features that one could ask for in a fish tank. They are highly durable, suitable for both freshwater as well as saltwater setups, come with extensive warranty, and seamless corners to make breeding easier.

All of them have the same dimensions but are different from one another in some way or the other. The common feature in all of them is their material, which is acrylic.

Acrylic aquariums are more preferred over the glass ones because of the ease-of-handling they provide.

The last one on my list is the Clear-for-life fish tank which is also made of acrylic. And the most amazing feature of this model is that it is available in four different backgrounds!


Make a thorough research and read reviews on different websites about them. You might come to know more about them.

In the end I would say that all five of the aquariums have something different to offer. So you have to make the purchasing decision wisely, according to your requirements.

Also, do not forget to check out the photos of these aquariums so that you have an idea about how they will look. Best of luck!

If you want any further information about the products and services we offer, kindly visit our website.

In case you have any doubts or you want to know more about any product, drop a comment in the comment section below. We would be happy to help you anytime!


[Revised and Updated for July, 2019]
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Written by Debra Hutchinson, founder of FishXperts

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