40 Gallon Fish Tanks & Aquariums (Kits & Stands)

A 40 gallon aquarium is not what you would describe as a large fish tank, but it definitely has enough room for larger fish and a good amount of plant life and decorative pieces. It can be a great addition in most homes, and although these tanks will typically require a stand to be displayed properly, they won't take up as much space as larger tanks like a 55 gallon aquarium or a 75 gallon aquarium. This guide will outline the best aquariums at this size, but before we get into the reviews here is a quick overview of our 40 gal guide:

Best 40 gallon aquariumsSellerWhere to buy
Aqueon glass tankAmazonCheck Price
Seaclear combo setAmazonCheck Price
Imagitarium standAmazonCheck Price


Now let's get into the more detailed reviews:



SeaClear 40 Gallon Fish Tank (Bowfront Acrylic Combo Set, less than $300)

What a way to kick things off! This 40 gallon aquarium from SeaClear is an absolute belter – an average score of 4 stars from users, available in 3 different colors and plenty of extra features to get you excited, this tank is all you really need to get started on your fish keeping adventures. This is described as a ‘combo set’, which basically means that it comes with a ton of different things that all work together to make a full aquarium kit. This includes:

  • Less than $300
  • Made from acrylic (lighter and stronger than glass)
  • Available in 3 colors
  • LED fixture and reflector in lid
  • Available in 3 colors (black, blue and cobalt blue)
  • Suitable for saltwater and freshwater species
  • Dimensions – 30 inches x 15 inches x 21 inches

SeaClear Acrylic Aquarium Combo Set

A combo set is sort of like the starter kit that we included in the list, but for more advanced fish keepers. The 40 gallon aquarium combo set involves a variety of accessories and items that will help you create the perfect aquarium for your fish, including:

  • Reflector – helps to spread the light around the aquarium
  • Acrylic – you already know how much better acrylic is!
  • Safe for saltwater or freshwater fish
  • Corrosive resistant

Clear-For-Life UniQuarium (PetSmart)

Another UniQuarium, which for the uninitiated means a fish tank that comes with a filter built in. Clear For Life are the specialists in UniQuariums, and this 40 gallon fish tank is no exception to their high standard of quality. Aside from the built in filter, here are the other features:

  • Acrylic – safer and stronger than glass, also lighter and acts as a better insulator!
  • Suitable for freshwater and saltwater fish
  • Available in Sapphire Blue color
  • Dimensions – 15 inches x 36 inches x 16 inches

SeaClear 40 Gallon Aquarium (System II)

This is a 40 gallon System II aquarium, which is not only a fish tank with an awesome name, it’s also an awesome tank full stop! It comes with a variety of features that make it simple to instantly create the perfect environment for your fishy friend. Here are the important features:

  • Wet/dry filtration system – helps to ensure that the aquarium is biologically and chemically balanced to perfection
  • Acrylic – as we’ve mentioned already, acrylic is a stronger and lighter material than glass
  • Smooth rounded corners
  • Media try – not for DVDs, but for heaters and other useful gadgets like that!
  • Available in Cobalt Blue
  • Dimensions – 15 inches x 36 inches x 16 inches

Perfecto Breeder Tank

This 40 gallon breeder fish tank is from a company called Perfecto, which despite their name, don’t seem to be that perfect. The breeder tank isn’t very well reviewed on Amazon, so I definitely wouldn’t recommend that you buy it unless you’re familiar with the products that Perfecto supply and know for certain that they are quality. You’ll need a tank like this if you plan to breed smaller fish like Bettas, even though we have a page dedicated to Betta fish tanks here. If you’re looking for a breeder fish tank, then you could simply pair up one of the above tanks with a divider. Here are the main features of this tank:

  • Acrylic – a safer and lighter material than glass
  • Decorative plants – perfect to get your tank started
  • Magnetically attached sweeper rod – a handy accessory to have!

SeaClear 40 Gallon Fish Tank Junior Executive Kit

Aside from sounding seriously awesome (‘Junior Executive Kit!’), this last entry in our list of 40 gallon fish tanks is definitely the best option for anyone who is looking for an ‘all in one’ solution to kickstart their fish keeping journey. Probably the best way to demonstrate the awesomeness of this fish tank kit is to simply list what you get with it, so let’s run through the main features:

  • Fluorescent fixture
  • Power filter
  • Plant decorations
  • Fish net
  • Fish food
  • Water conditioner

Innovative Marine Aquarium

40 gallons is actually the standard size for most Innovative Marine aquariums, so you could consider this product to be their ‘main’ type of fish tank. This is a fairly straightforward and reliable tank that does exactly what you need it to do – keep your fish safe and happy. This tank has a similar design to the aquarium featured on our 10 gallon fish tank page. The main features of this aquarium include:

  • Made from low iron glass for excellent clarity
  • Dual overflows + acrylic filtration
  • 45w pump
  • Available in black
  • Rectangular
  • Dimensions – 24 inches x 20 inches x 19 inches

SeaClear Aquarium

We’ve already had a couple of SeaClear 40 gallon aquariums listed in this countdown – one being a starter kit and the other being the fancy ‘System II’ tank. This is more of a traditional and classic tank, but still has everything you’d need to keep your fish happy. This tank has an almost perfect score from reviewers, and also qualifies for free shipping. Other notable features of this aquarium include:

  • Made from acrylic – lighter, stronger and clearer than glass
  • Available in 2 colors (black and white)
  • Fluorescent light fixture
  • Dimensions – 15 inches x 36 inches x 16 inches

40 Gallon Fish Tank Stands

Aquatic Fundamentals 40 Gallon Fish Tank Stand

This stand is designed for fish tanks that are slightly heavier than 40 gallons, and it has a powder coating which helps it to resist moisture easily.  We also have a smaller version of this stand over on our 20 gallon aquarium page if you’d like to check that out. To find out more about the dimensions and pricing for this item, check it out below.


Top Fin RTA 40 Gallon Aquarium Stand

At less than $150, this is an incredibly cheap 40 gallon aquarium stand – especially considering the size and design of it. This stand will not only provide great support and protection for your 40 gallon fish tank, it also looks great and could act as a stylish piece of furniture in any home. It also has space for other items that you might need for your fish, and the picture even shows it storing books! Here are some of the main features:

  • Can support 450lbs
  • Has 2 open front cubbies
  • Laminated – gives it a glossy look
  • Also found on our 30 gallon fish tank page

SeaClear Aquarium Starter Kit

Anybody who has taken a look around our website knows that we’re big fans of SeaClear products, and this 40 gallon fish tank is no exception. It’s a starter aquarium kit, which means it comes with a whole bunch of goodies to help you get started on your fishy adventure. Here’s the main features of this 40 gallon beauty:

  • Acrylic – A stronger and lighter material than glass
  • Electrically approved hood – features fluorescent lighting
  • Power filter – ensures the water in the rank remains clean and safe
  • Plant decorations – helps to immediately create a comfortable environment for your fish
  • Net and fish food included – 2 helpful accessories that will help you to enjoy your fish tank even more!
  • Dimensions – 36 inches x 15 inches x 16 inches

CAD Lights 45 Gallon Fish Tank

This is a CAD lights 45 gallon fish tank, a brand that we’ve featured elsewhere on our site (as we’re big fans of the look and features of this tank). Aside from the classy white color, the shallow construction of this tank makes it perfect for creating a reef aquarium. The main features of this tank include:

  • Ultra clear low iron glass (for clear viewing)
  • White stand
  • 45 inches tall (including stand and tank)
  • Silent flow pump

40 gallons is somewhere between being pretty big, and pretty medium sized for a fish tank or aquarium. It's generally considered to be a pretty good size for most fish and most homes, because it won't take up too much room, but it'll provide more than enough space for most species of fish. We've selected the following collection of 40 gallon fish tanks based on reviews from real people who've bought and used them. We've included a wide selection of products in the list, some for beginners and some for more advanced fish keepers.