Fish Tanks, Product Reviews

Best 40 Gallon Fish Tank: Breeder, Long and more

Finding the best 40-gallon fish tank has never been so easy. No matter if you are searching for a breeder, long or normal tank, we’ve got you covered.

Best Bow Front
Best 40 Gallon Fish Tank Vepotek 40-Gallon Acrylic Bowfront
Vepotek 40-Gallon Acrylic Bowfront
Best Acrylic
Best 40 Gallon Fish Tank Seaclear Acrylic Aquarium Combo Set
SeaClear Acrylic Aquarium Combo Set
Best Budget
Best 40 Gallon Fish Tank Clear-for-Life 40r Rectangle Uniquarium
Clear-For-Life 40R Rectangle UniQuarium
Best 40 Gallon Breeder Aquairum Option

We’ve always been fascinated by the aquatic world, and while we haven’t discovered much, we’re thrilled and intrigued by what we’ve discovered so far, and we’re always on the search for more. Fish are the aquatic creatures that have most grabbed human curiosity to the point that humans currently coexist with them. 

Our fascination with fish has developed due time, going further and further to broader and broader species and environments we created for them. The main environment a fish lives in is definitely the tank. We are continuously looking for the best for ourselves, and that will and curiosity has expanded to our pets and fish especially, as we continue to search for the best possible home for them. 

We’ve gone through all sorts of phases when searching for that and came up with different sizes that cater the best to our needs and our fish’. If you think you’re ready to adhere to the responsibility of caring for other beings, a 40 gallon fish tank is a great option, and yet, requires a little thought behind it.

Large fish tanks always require a little more effort and time than nano aquariums. Before purchasing the best 40 gallon aquarium ask yourself one thing. Where would you put your tank?

A 40 gallon fish tank weighs around 458 lbs meaning you can’t put it on top of any furniture. If you have not been prepared for that, then you must purchase an aquarium stand. The best 40 gallon tank stand can keep your large tank safe and stationary.

  1. Best Acrylic: SeaClear Acrylic Aquarium Combo Set
  2. Best Bow front: Vepotek 40-Gallon Acrylic Bowfront
  3. Best Budget: Clear-For-Life 40R Rectangle UniQuarium
  4. Best Reef: Advance Aqua Tanks Acrylic
Best 40 Gallon Breeder Aquairum

Pros and Cons of a 40 Gallon Fish Tank

If you never had a 40 gallon fish tank before, these tanks can be really cool. We gonna look through some of the advantages and also at some of the things you should think about and consider if you gonna be buying a 40 gallon fish tank.


Starting with pros:

  • A 40 gallon fish tank dimensions are  48 x 13 x 16 for a long tank and 36 x 18 x 16 inches for a breeder tank. The size makes it look substantially compared to other smaller sizes like 20 gallon tanks or 30 gallon fish tanks. In this tank, you are getting a large viewing panel. 
  • When it comes to aquarium maintenance a 40 gallon fish tank is a much easier tank to work with compared to 50 gallon fish tank or more.
  • If you happened to be someone who is a little bit shorter and have shorter arms the 40 gallons is ideal for you. Thanks to these tank heights it would be easier for you to reach the bottom of the tank, it’s gonna be easier to plant plants or even catch your fish.


There is one thing worth mentioning on the disadvantages of a 40 gallon fish tank:

  • The accessories that go along with your tank. For example lids. A 40 gallon tank has kind of an odd size and is not a very common size to find glass lids. You probably can find them but would be a little bit expensive. The same goes for other accessories.
best 40 gallon breeder aquairum inside

What to Look for When Shopping for the Best 40 Gallon Fish Tank

It takes an extensive amount of research to fully understand, let alone and be prepared for the many details that make up the build of fish tanks that need to be factored in when purchasing one, from the demands of you and your fish that they cater to, all the way up to your existing circumstances. 

Before you even make your first physical step inside a store, the first and foremost thing you need to be aware of is the overwhelming amount of alternatives you have. Obviously, you can’t expect any amount of decent quality if you’re making big compromises on the price because, although it isn’t everything, it’s one of the main indicators of product quality. 

The cheapest alternatives, however attractive they may appear, are highly unlikely to provide you with a solution to your problem, perhaps only a temporary fix of an aquarium that barely fulfils your most basic requirements. 

Thankfully, our team will not let you down as we have formulated this to-do list you can use as a guide to undoubtedly help you find all that you need to know to choose the best 40 gallon fish tank.


Curved front: If you’re looking to mix in some modern with a touch of traditional this has got to be your go-to option. A curved front tank is usually a one-piece in a tank manufacturer’s collection. The unique design is sure to stand out and make a great impression on the eye.

Round: Not really much to say about these guys, they’re obviously shaped into bowls. They are the small fish tanks you see in dorms or small spaces. Their round shape is usually a matter of aesthetics so there really are no pros or cons to this model.

Cube: Inarguably the most popular of them all, cube aquariums are most probably that image that pops into your head first when you picture domesticated fish. They basically fit in everywhere, it’s impossible not to find a stand for them and they look so put together that they’re easily paired with any type of environment or interior decor.


Glass aquarium: Glass is the most common material in the fish tank making business. The traditional look of it summoned together with the nostalgia of feeling a glass aquarium surely play a major role in the reason behind that. Needless to say, it is extremely heavy, especially in bigger sized tanks, making it a pretty inappropriate choice of material if you like to move things around a lot in your space.

Be wary of its delicacy especially if there are little children or pets that love moving around a lot in whatever place you’re planning on keeping the tank in. Regardless if you judge that there is inconvenience between a sleekest and elegant tank, said delicacy serves as a great choice. 

The difference in price compared to other materials is wide. The one in quality is not at all so. Either way, general statistics should not stop you from calculating and deciding on your options freely.

Plastic aquarium: So many people freak out about the quality of plastic used to make home for your fish and its suitability in being that. We can tell you confidently that even though such conspiracies have spread like fries as a result of misinformation, there is no absolute truth in them. 

Truthfully, plastic tanks do not prove to display any obvious setbacks regarding keeping your aquatic environment healthy. It is indeed easier to scratch but how much would you even be able to move a 40 gallon tank for it to be able to pick up any scratches?! 

On the contrary, this material might prove to be safer in the case that there are children or animals in the house and accidents waiting to happen. Besides your specific tastes and preferences, there really are no significant differences between plastic /acrylic and glass aquariums.


It is of no question that any item that is bought to be put in or decorate the home environment must blend well with it. Therefore, unless your house is a 50s dream house, modern fish tanks will be your best friends. Really there is very little room for mistakes here since a unique aquarium setup can up your interior design game and bring your living environment closer to the future. 

While most of the tanks we review are part of this contemporary and future-proof design, Fluval is the brand that focuses the most on the way the tanks look while also ensuring great quality. Other tanks are just as amazing, so don’t forget that all the shapes and designs and fancy words are just factors that distinguish one tank from a few others, not put them in a hierarchy.

Best 40 Gallon Fish Tank

Types of Fish Tanks

When choosing the best 40 gallon fish tank is important to know the types of ecosystem you will add to them. That’s because for different ecosystems you need different accessories and it’s better when those accessories are included in the aquarium kit.

Not only that but some of you may be new to the hobby and need some guidelines on which set up to choose, freshwater or saltwater one.

Freshwater Fish Tank

Freshwater tanks generally are less demanding in terms of care, they’re much more movable so they’re basically perfect if you enjoy reinventing your spaces often and they’re cheaper than most other alternatives.

As a beginner, you are always encouraged to start off with one of these guys because it’s really hard to mess up and they are also easy to manage if you don’t really have a lot of time to spend on an Iot of tasks. 

This type of tank is the one most people go through with for their first purchase and very often the choice they tend to stick with the longest because of how easy they are to manage. The type of fish you have determines the type of ecosystem most suitable for them.

Saltwater Fish Tank

With saltwater tanks, you might find it a more difficult job giving your fish the proper TLC. These tanks do however make more space for diversity and a more versatile environment to alternate between species of fish. 

We do typically recommend this type of aquarium to more experienced fish owners who know how to really find an interesting approach to it. The endless possibilities are made possible by this ecosystem which doesn’t fail in the slightest to justify the money spent on it through the amazing things you’re going to get out of it.

Our Top Picks

Out of all the products in the market, our team has chosen the best and came up with the ultimate list to find the best 40 gallon fish tank. Regardless of your preference, whether you prefer a freshwater fish tank or saltwater or an all in one fish tank, you’ll find your fit below.

Best Acrylic
Best 40 Gallon Fish Tank Seaclear Acrylic Aquarium Combo Set

The deluxe kit and the basic combination package are the two versions for this 40 gallon fish tank set. The deluxe version is simply called like that due to some extra decorative things included, that if purchased alongside the tank like this will spare you some time and effort to pick out later. 

Besides that, both versions include a hood with a light fixture (bulbs not included) as well as a 40 gallon fish tank filter, pebbles and a guide. They’re both the same size, 36x15x16 and made with acrylic. Appropriate for either freshwater or saltwater set up and overall a great option for people that are just getting started due to the inclusion of things. It could’ve been nicer and easier to include the bulbs, but then it would’ve been practically flawless. There’s nothing to worry about besides that maybe you’ll be staring at it a little bit too much once it’s all set up.

Product Specs

  • Dimensions: 36 x 15 x 16 inches
  • Weight: 20 pounds
  • Material: Acrylic
  • Filter: Yes
  • Shape: Rectangular


  • Strong and lighter than some other alternatives
  • Good quality and easy to handle
  • Contains most things that you’d need
  • Affordable


  • Lack of lightbulbs

Best Bow front
Best 40 Gallon Fish Tank Vepotek 40-Gallon Acrylic Bowfront

This tank is for all the folks out there that just have to show their originality in every bit of their life, including their home and their fish tank. This piece is obviously made to capture everyone’s attention and bring it to this special and unmatched design. It captures elements from all tank forms out there and puts them together to create a 40 gallon tank that can be your new obsession. 

It’s big, it’s shiny and beautiful and constructed of strong and durable acrylic. It’s got a built-in feeding tube for ease and in the box, you get the filter, the pump, another pump for air and a bio ball. There are endless possibilities with this one and if you’re bold enough you can put it right in the centre of your living room and use it as the main decor piece. 

An edgy choice for edgy people, this is sure to satisfy from your casual arts enjoyer to minimalists to metalheads. From A to Z this one has you covered in aesthetics, usability and value for money.

Product Specs

  • Dimensions: 31.5 x 13 x 59 inches
  • Weight: 45 pounds
  • Material: Acrylic
  • Filter: Yes
  • Shape: Unique


  • Strong and durable
  • Great design
  • Includes basics in box
  • Offers a good view


  • Due to its special form you might have troubles with stands to put it.

Best Budget
Best 40 Gallon Fish Tank Clear-for-Life 40r Rectangle Uniquarium

This model is one of Clear for Life’s premium products and features a filtering system, and is suitable for reef or freshwater plant setups. The Clear For Life brand is recognized for producing high-quality items, and the 40-gallon Uniquarium is no exception, coming with a limited lifetime warranty to support this claim. 

This high-quality tank includes a great filtration system and provides a good value per money. Because of the exceptional quality of the product and the very light maintenance to keep it working right, it is an excellent tank for both experts and beginners, making it a great choice regardless of your experience. Besides these, the tank has a unique sapphire background colour that looks incredible with the water and the fish inside the tank. Unmatched in quality and amazing for aesthetics, you couldn’t ask for anything more.

Product Specs

  • Dimensions: 36 x 15 x 16 inches
  • Weight: 46 pounds
  • Material: Acrylic 
  • Filter: Yes
  • Shape: Rectangular with round edge


  • Thick glass
  • Pump and filter included
  • Water and corrosion-proof


  • None

Best Reef
Best 40 Gallon Fish Tank Advance Aqua Tanks Acrylic

The name describes this product fully. This is an advanced tank that will make everything just a little bit classier. This tank is made from the acrylic meaning it’ll be light and bright enough as well, but also give you extra protection by being shock-safe and since acrylic doesn’t shatter like glass, some protection in case you drop it is provided as well. 

Regardless of the material, the look isn’t at all affected, for this tank has a real classic vibe to it and the lack of bezels make it look really fine and elegant. However don’t get caught aback because in the modern environment, this tank for sure will only add to that due to its form and elegance. Included in the box you get a hot water drain, a hood and filter slots which are the basics of what you need, by keeping the water clean and your fish safe.

Product Specs

  • Dimensions: 36 x 15 x 16 inches
  • Weight: 60 pounds
  • Material: Acrylic
  • Filter: No
  • Shape: Rectangular


  • Cleaning equipments included
  • Durable and Sturdy
  • Age-proof
  • Best for all interiors


  • A little expensive

Our Verdict

Out of all the options listed above, we can assure you that each one has a certain quality and is made for everyone regardless of their years of experience. They’re all different in style and design and usability however the same in quality and value and everything that sets out a good tank. 

The key is to make your choice based solely on how useful each of these tanks is for your personal case scenario. You can and should choose according to what’s best for you and your fish, without compromising anything for a lower price.

Although we sometimes think that something cheaper is best, in time you’re going to have to make several purchases to make up for the lack of the product and end up spending way more than once with a durable, quality product. 

Besides, cheap tanks may cause problems to your fish too, up to the point where they’re in danger for their life. Anyway, the choice is yours and yours only, so make a wise one, that will benefit you for years.

How We Choose the Best 40 Gallon Fish Tank

Our team went through all the possible choices to come up with these products. All of the products were chosen with the intention of ticking all the boxes while also satisfying the requirements. Choosing the right tank might be tough if you don’t take into account variables such as having other pets or children in the house. 

All of these products are built to last and will create a safe atmosphere in any situation. To their credit, all of the companies are well-known for their fish-related merchandise. Either way, we also made sure to do a background check on the companies themselves just to make sure. Finally, we’ve produced a thorough list of the best 40-gallon fish tanks on the market, and we’re certain that they will be useful to everyone.


If you’re wondering what kind of fish are good for your new best 40 gallon fish tank or if a 40 gallon tank is good for you, read on for info and answers to other common questions.

Q: What Kind of Fish are Good for a 40 Gallon Tank?

A: A 40 gallon leaves quite a bit of space for versatility when it comes to fish and fish species. YOu’ll have quite a bit to choose from, even some that are less popular.

The most common fish housed in a 40 gallon aquarium are: Gruppies, Zebra Danio, Cory Catfish, Goldfish, Mollies, Betta, Three Spot Gourami, Banggai Cardinalfish, Bristlenose Pleco and all sorts of Cichlids like Dwarf Cichlids, Firemouth or Peacock cichlids. 

Besides these fish that can be combined, you could also choose to combine with plants, creating a paludarium if both kinds of species take about 50% each.

Q: Is a 40 Gallon Tank a Good Size?

A: Depending on the fish you get, 40 gallons is convenient and a perfect size if you need something big but not insanely big. There’s much to do with all that space, but when it comes to fish, this one can house either a couple of medium fish or groups of small fish. 

You can find many decorations and/or fish breeds that are more than suitable for this size and it’s not as big as to become a problem about the place where you’ll put it or additional expenses. Just keep in mind that you’re going to need a stand, and luckily we have a list of the best stands for 40 gallon tanks.

Q: What’s the Size of a 40 Gallon Fish Tank

A: When it comes to dimensions, they vary, but the average is around 36 inches L, 16 inches H and 18 W. It’s around 181 liters meaning heavy but not way too heavy. If you need a tank that doesn’t take up much space the Vepotek 40-Gallon Acrylic Bowfront has a smaller base than most and will fit it almost anywhere.

Q: What’s the Difference Between a 40 Gallon and a 40 Gallon Breeder Tank?

A: 40 gallon tanks are divided into 40 high which is a fish tank with the dimensions mentioned above, a 40 long, which is essentially just a long fish tank, and into 40 gallon breeder tank. As you probably noticed, the usual 40 gallon tank has a rectangular base, making it a little hard to reach inside. 

Breeder tanks are made with a square bottom and have more floor space. That is to make it easier for them to have easier access to their fish. This dimension is better for fish keepers that plan to breed their fish due to the ease of catching fish and handling them. However, breeder tanks aren’t exclusive to fish breeders only.

There’s a bunch of people that appreciate breeder tanks for their form and use them for other pets like turtles or want to create landscapes underwater. There’s much space to go crazy with and experiment, and that’s why this tank is so popular. Our breeder tank of choice would be the SeaClear Acrylic Aquarium Combo Set which was so good we even awarded it as our best overall tank of choice.

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I am Mario, a expert aquarist who is sharing his knowledge with everyone.

Keeping innocent fish and aquatic plants safe and healthy is my daily routine. With my experience and my passion for aquatic life, I will advise you through the long run of keeping an aquarium.

Disclosure: participates in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for publishers to earn fees by linking to and affiliated sites.