Best 40 Gallon Aquarium – Review & Guide

If you are a fish owner or an aspiring fish owner, then you may be in need of a new tank. Forty gallons is a great size for your next fish tank.

There is plenty you can do with a forty gallon aquarium. You have the option to breed, aquascape and keep a variety of different kinds of fish. Whatever your plans may be for your next tank, it is important to choose the right tank.

A high quality tank is important to any fish keeper. It is the place where your fish will spend their lives. You certainly want them to have a comfortable place to call their home. A higher quality aquarium will also be more enjoyable for you as well.

Before you buy just any tank, get familiar with what makes a good forty gallon aquarium. We will help you out by telling you what to look for in an aquarium and what we think are the best to choose from.

40 Gallon Aquarium Reviews

Sea Clear Acrylic Aquarium Combo Set

The Sea Clear Acrylic Aquarium Combo Set includes a 40 gallon tank and a high quality lighting fixture. This acrylic aquarium is a great start for setting up a 40 gallon tank.

This tank is made from acrylic material, which provides clarity and resistance to damage. These are important features, especially for a long-term tank. You will also find that this material makes this 40 gallon tank much lighter than a glass tank.

The acrylic material is also resistant to fluctuating temperatures. If you are looking to get fish that may be sensitive to temperature change, this aquarium is a good option for you to consider.


  • The acrylic material allows you to see your set-up clearly
  • The acrylic material is more sturdy and light than a glass material
  • The lighting fixture has multiple options so that you can personalize the lighting in your tank
  • The acrylic material is resistant to fluctuating temperatures


  • The lighting fixture must be removed to feed the fish
  • A bulb must be purchased separately for the lighting fixture

Clear-For-Life UniQuarium 40R Rect PARENT

The 40 gallon UniQuarium from Clear-For-Life is a sleek, simple aquarium that makes for a great start to your fish set-up.

The UniQuarium includes a ready-to-run filtration system. No need to buy a separate filtration system for your aquarium. This model from UniQuarium is a great place to start if you are not familiar with the different options available for filtering your tank.

This tank is also made out of sturdy, clear acrylic and has modern rounded corners. These features make for a unique design that is sure to make a wonderful aquatic set-up.

The tank has a separator between the living space of the fish and the filtration system. You can decorate this tank however you like without having to worry about the appearance of the filter.


  • This tank includes a filtration system that is ready to use upon set-up
  • The sleek, rounded corners make for a unique fish tank
  • The acrylic material is sturdy and resistant to damage
  • There is a separator between the living space and filtration system


  • This tank does not include a lighting fixture
  • This tank does not include a hood or cover

Aqueon Tank Breeder Black 36X18X16 40gal

The 40 gallon Aqueon Tank Breeder is a simple choice. Because of its simplicity, this tank can be customized in many different ways.

With high-quality glass construction and silicone sealed edges, the Aqueon Tank Breeder is put together with great care. This tank is built to last so that you can keep fish in it for a long time.

This tank is a go-to for many breeders, but whether you are looking to breed fish, have plants, or just keep fish, this simple but well-made tank will make for an easily customized aquarium.

Because the tank is made from glass, it is heavier than similar models that are made of acrylic. Even without water, this tank is quite heavy, so take care when moving it.


  • A simplistic design allows for plenty of customization
  • The sealing is very strong to prevent leakage
  • The simplistic design is ideal for breeding, but this tank can be used as a regular aquarium as well


  • This aquarium is heavier than acrylic designs
  • Glass is not as resistant to damage as acrylic – be careful!

Vepotek 40-Gallon Acrylic Bowfront Aquarium Fish Tank

The Vepotek 40-Gallon Acrylic Bowfront Aquarium has a unique cylindrical design that can certainly add character to any room. This aquarium has many features that make it an excellent choice for your next tank set-up.

This aquarium has a sleek black stand to make your tank look complete without an additional purchase of a stand. This built-in stand also has a modern and unique look. This tank will look lovely in any room you choose. The bowfront design of this tank is also a great feature. You can see your fish and aquascaping from a unique perspective.

It also includes a full filtration system so that your tank will stay clean and clear. The filtration system is quiet and high-quality so that it will last for a long time. This system will certainly help you keep up with the maintenance of this aquarium.

The acrylic material of this aquarium provides clarity and strength. This aquarium is built to last. Acrylic is less reflective than glass is and will allow you to have a very clear view of the inside of your aquarium.


  • There is a built in filtration system and lighting system
  • The cylindrical, bowfront design in unique and beautiful
  • The acrylic material is more sturdy and less reflective than glass
  • The aquarium is built with a stand


  • This tank is built for freshwater only
  • The bowfront can distort the view of the tank

SeaClear System II Acrylic Aquarium

The SeaClear System II Acrylic Aquarium is another good choice for anyone looking for a 40 gallon aquarium. This kit includes a filter and a hood with lighting that will make the process of setting up the tank much easier.

This tank is made from acrylic. The acrylic material helps will give you a clear and vivid view of what is inside of your aquarium.

Acrylic is also much lighter than glass, so transportation will be simpler when needed. Not only is acrylic lighter and better for looking within your tank than glass, but it is much more resistant to damage.

This aquarium includes a built in filtration system and hood with lighting. It includes much of what you need to get started with your aquarium set-up.


  • This tank includes a filtration system
  • This tank includes a lighting system
  • The acrylic material is resistant to damage and more clear than glass material models


  • The lighting included is not powerful enough for the size of the tank
  • The included filter is too large for the tank

Marineland (Aquaria) Biowheel Aquarium Kit

The Marineland Biowheel Aquarium Kit includes all of the basics to a good aquarium set-up. This 37 gallon tank is an option to consider if you are looking to purchase a tank.

Marineland’s Biowheel Aquarium Kit includes a fitted hood and LED light. The LED light has multiple modes so that you can customize the look of your tank and modify it depending on the time of day.

The kit also includes a filter and cartridge to keep your tank clean and to help keep up with necessary maintenance.

This tank is great for beginners because it also includes a 200 watt heater, fish net, food and water care samples. These are some of the basic essentials for any fish owner.


  • This tank is great for beginners because it includes the main fish-keeping essentials
  • The tank includes a filtration system and filter cartridge to get you started
  • This kit includes a LED light system with multiple options


  • The LED lights do not last long and may need to be replaced after a few months

Landen 48 Gallon Rimless Low Iron Aquarium Tank

This 48 gallon tank from Landen is made from high-quality, low iron glass. This glass is crystal clear for an amazing view of your fish and tank set-up.

The rimless design of this aquarium is sleek and simplistic. It is a great option if you are looking for a clean, minimalist tank. This aquarium is wonderful for plant-keepers and fish-keepers alike.

This tank is put together with high-quality silicone. It is made to last so that you can have a long-term tank. It is able to withstand the pressure that 40 gallons of water creates.

This tank does not have a lid or light included. You may want to consider investing in a lid that does not need to sit on the tank. The rimless design makes finding a lid that fits properly difficult.


  • This tank is high-quality and made to last
  • The glass is very clear for a beautiful view of your tank
  • This tank has a sleek, simplistic design with no rim


  • This tank is heavy
  • This tank is not built to have a lid, so a hovering lighting system and fish that will not jump are necessary

SeaClear Acrylic Aquarium Junior Executive Kit

The Acrylic Aquarium Junior Executive Kit from SeaClear is a good choice for a beginner or hobbyist. This tank includes some of the fishkeeping essentials to get you started.

This kit includes a filter to keep your tank clean and to help you keep up with the maintenance. The filter is powerful enough for a 50 gallon tank, so it can be reused if you ever choose to upgrade or purchase a larger tank.

The Junior Executive Kit also includes a thermometer, a net, and a few decorations to get you started. This makes it great for beginners. However, it is important to be aware of the decorations you are using. The ones included in this kit are dangerous to fish with fragile fins.

The fluorescent lighting fixture included with this tank will brighten it up and give you a clear view of your aquarium. A fluorescent light can also help you if you are hoping to have live plants in your aquarium as it will encourage growth.


  • This kit includes a filter, a net and a thermometer to get you started.
  • This aquarium includes a fluorescent lighting fixture
  • This tank is great for beginners and hobbyists keeping freshwater and saltwater fish


  • The plastic plants included are not ideal for fish with fragile fins
  • A bulb must be purchased separately for the lighting fixture

Aqueon Deluxe LED Bow Front Aquarium Kit Black 36 Gallon

The Aqueon Deluxe Bow Front Aquarium kit is another great kit for beginners and hobbyists. This kit includes some of the fishkeeping basics that you will need to properly care for your tank.

This kit includes a fitted lid and LED lighting fixture that will brighten up your tank for you to view your fish. The bowfront can also provide a great magnified view of the inside of the aquarium, but can also distort what you see.

Aqueon’s aquarium kit also comes with a filter and a filter cartridge. These are essentials for any fish tank that will help create a healthy environment for whatever fish you choose to keep in this aquarium.

This kit includes a submersible preset heater for your aquarium. Many fish require a heated environment. It is important to get your tank up to the proper temperature before adding fish to the aquarium.


  • This tank includes many of the basics that a fish-keeping beginner would need
  • This kit includes a QuietFlow Power filter and a filter cartridge to start with
  • The lid includes a slot for a secondary LED lighting fixture of your choice


  • The lid falls apart quite easily and may need to be replaced over time
  • The bowfront design can distort the view of the inside of the tank

Fluval Premium Bow Front Aquarium Kit

The Fluval Premium Bow Front Aquarium kit includes much of what a beginner or experienced fish-keeper may need for a new aquarium set-up. This high-quality kit will help you get your 40 gallon tank started quickly.

Fluval’s Premium Bow Front Aquarium kit is made from shock-resistant, sturdy glass. This makes it a perfect long-term tank for your next fish set-up. This kit also includes a cover with a built in LED light so that you can see within your tank clearly.

The tank also includes a heater which can be important if you want to create a healthy environment in your aquarium. Many fish and plants require a warm environment.

The filter that is included in this kit will help you to create a clean environment for your fish. Because it includes a high-powered filter, this tank is ready to get set up right away.


  • This kit includes a heater and filter
  • This aquarium is made from high-quality and sturdy glass
  • This kit includes a cover and built in LED light


  • This aquarium is made for freshwater fish only
  • The bowfront design can distort your view of the inside of your tank
  • The glass material is heavier than acrylic models

How to Select a 40 Gallon Aquarium

When purchasing a new aquarium, it is important to select one that will suit your needs and last you for a long time. There are a couple of things that we can suggest to help you find one that meets these expectations.

Materials. When you are looking for any size aquarium, you want to make sure that it is made from high-quality and sturdy materials. You should be looking for high-quality materials that will be resistant to damage from impact and over time. The higher the quality of the materials, the longer the aquarium will last.

Size and shape. The dimensions of an aquarium determine where you will be able to place it. You should make sure you have a place to keep your aquarium. A 40 gallon aquarium can be quite large, and they can come in many different shapes. This should certainly be considered when you are purchasing.

Capacity. One of the most exciting parts of purchasing a new aquarium is stocking it. It is important to consider how many fish can be kept in the 40 gallon tank you are considering. Whether it is a vertically or horizontally shaped can also determine what types of fish you can keep in your tank.

Additional items included. Some aquariums come in kits that include things like lighting fixtures, lids, heaters and more. If you are a beginner or just want to make one purchase that includes several things, then it is important to look for a kit that includes fish-keeping necessities.

Advantages of having a 40 Gallon Aquarium

A 40 gallon aquarium requires lots of upkeep and care, so why invest in one? There are many reasons you should consider investing in a 40 gallon aquarium. Here are some of the biggest reasons that we came up with for you to consider.

You can keep a variety of fish. Many types of fish require lots of space. A 40 gallon tank can accommodate many species of fish. You can combine different species to create a realistic environment in your aquarium. Most 40 gallon tanks can also accommodate either freshwater or saltwater fish.

You can keep more fish. A 40 gallon aquarium gives you the opportunity to stock your tank with lots of different compatible fish. While it is important to do research on what types of fish are compatible, there are endless combinations you can try. You can enjoy watching and caring for plenty of different kinds of fish in your aquarium.

You have lots of room to decorate. Decorating an aquarium with plants, rocks and other interesting décor can be one of the most exciting parts of keeping fish. A 40 gallon tank has ample room to customize with your favorite decorations. You can choose a more natural look or go for a fun theme that you will love.

Aquariums reduce stress. There is a reason so many waiting rooms and  offices have fish tanks. Watching beautiful, colorful fish can be extremely relaxing. Investing in a 40 gallon tank can give you the opportunity to reduce your levels of stress. Caring for an aquarium can also be extremely rewarding, which also contributes to the reduction of stress.

Care to Take with a 40 Gallon Aquarium

A 40 gallon aquarium is a big investment that comes with lots of upkeep. We wanted to make sure you have taken a few different precautions before you make your purchase.

Transportation. 40 gallon tanks can be heavy even when they are empty. When transporting a 40 gallon tank, you should always take care and have someone there to help you. If you are travelling with a tank, be sure it is empty and has support to avoid damage.

Cleaning and water changes. 40 gallon tanks are quite large. No matter what kind of fish you are keeping in your aquarium, some form of cleaning or water changing will be necessary. Cleaning your tank is an important responsibility. You must be willing to put the time that is necessary into cleaning and caring for your aquarium.

Types of fish. Make sure you select the proper fish for this tank size. Doing research into what types of fish can assure that you are not mixing fish that do not get along and that they are in a proper environment. Making your aquarium a proper environment for your fish will make it much easier for you to manage.

Amount of fish. Be careful about overstocking your tank. Different types of fish require different amounts of space. Overcrowding can lead to hostility, disease and the possible loss of your fish. Research the amount of fish that can safely be kept in your tank.

How to Set Up 40 Gallon Aquarium

Set up depends on what you are keeping in your aquarium. Different types of fish and plants require different types of care. There are a few simple steps to follow when you are setting up your tank.

Put it together and fill it up. Give your new aquarium and any supplies a good rinse before putting them together. Setup an aquarium thermometer to check the temperature is suitable for your fish. This will assure there is no dust or dirt that will harm the fish. Once you have all of your pieces together, you can fill it up with gravel and water.

Decorate. Finding the perfect decorations for your aquarium can be so much fun. Always rinse your decorations just as you would rinse supplies. Decorate with the proper décor for your choice of fish. Some fish require hiding places while others prefer more open space. There are so many possibilities when you are decorating your aquarium to make it your own.

Cycle your tank. You can not put fish in an aquarium right away. You need to cycle your tank first. Many people skip this step and do not realize that it is vital to your aquarium’s well-being. Different species of fish have different needs, so do your research on what type of cycling must be done for your aquarium.

Put your fish in. Now that your tank is all set up, you are able to introduce your fish to their brand new home. Slowly assimilating your fish separately is the best way to add fish to the aquarium to assure they will not be shocked. Once the fish are added, be sure to monitor them carefully until they are adjusted to their environment

The Wrap

As you are looking for your next tank, hopefully you will keep our choices in mind. There are a lot of features to look for when you are buying a new tank and we want you to be aware of all of the different options that are available to you.

Many kits include some of the essentials that you may need to start a new tank. It can be helpful to find a kit like this so that you can get started immediately. Other aquariums do not include any additional items, but this can be a great choice if you are looking to have full control over the customization of your tank.

With all of the choices that we have given you, hopefully you have come across a 40 gallon tank that you like. Let us know if you need more information about finding the right 40 gallon tank. We would also be glad to hear about your fish-keeping experience.

Leave a Comment