5 Best 20 Gallon Fish Tanks 2021 Reviews

20 Gallon Fish tanks are the perfect choice for beginners. We can keep different types of species in this tank because of its large water capacity.

We can also decorate it with different artificial plants and shrimps. These tanks usually come along with a starter kit which helps the user to easily understand the setup of the tank. 20 gallon is also best for the aquarist.

They can use it for their fish breeding purposes. There are different brands which are offering 20-gallon tanks in different shapes and styles.

In this post, we will show you top 20 gallon fish tank on the market. Let’s check it out!

5 Best 20 Gallon Fish Tank

1. Glofish Aquarium Kit Fish Tank

It has a crescent shape design with seamless rounded corners which give a beautiful view to your fish. It is made of acrylic material that gives a clear view.

It has a three-stage filtration system. With its adjustable flow filter pump, we can easily clean our tank. Its Mechanical filter cleans the dirt and debris from the cartridges. It’s chemical

Filtration cleans odors and impurities from the cartridges. Its Biological Filtration cleans bacteria from the cartridges.

This Glofish product has 15 blue LED lights which give an awesome view to the tank. Fish glow in the LED lights in a very beautiful way. It lights up the whole tank very easily.

The lights feature of this product helps in the feeding process. We can easily feed the fish because the LED lights are hinged and always remain closed except when feeding the fish or in the cleaning process.

This Nano tank has a water capacity of 3 Gallon, 5 Gallons, 10 Gallon and 20 Gallon.

This Glofish aquarium comes with a lot of decoration accessories like artificial plants, novel ornaments, and colored lights. We can easily give our tank a beautiful view with the help of these decoration accessories.

It is a very light weighted product as compare to its size. It comes along with many LED lights that give a bright look to the tank. It has large internal filtration system which reduces our workload in the cleaning process.

This tank is not good for saltwater fish keeping.

2. Seaclear Acrylic Aquarium

This 20-gallon fish tank has a crystal clear view. This feature adds a benefit to the cleaning purpose. We can clean the tank easily and fast because of its clear view. We can also easily see the fish and plants in this tank very clearly.

This tank has an acrylic glass material that is unbreakable even in earthquakes. It is stronger than glass and controls the temperature as well.

This product has a half weight compare to a glass tank that why it is easy to carry from one place to another.

This acrylic fish tank has a feature of heat and breakage resistance. This is the reason why it is safe to keep around pets and children.

It has an LED lighting system that helps to give a beautiful view and which keeps plants and fish alive. It also includes a reflector and electrical 24 light fixtures.

This aquarium is safe for freshwater as well as saltwater. We can keep freshwater and saltwater in this tank easily.

This is the best 20-gallon tank. It has a clear image which helps in the cleaning process of the tank. We can easily view our species in this tank due to its sea clear feature.

It is a safe aquarium for pets and children. It is unbreakable that why we can keep it around our pets and children.

The top piece of this aquarium is inconveniently designed.

3. Tetra 20 Gallon Complete Aquarium

This tank has a beautiful and sleek design. It gives a clear image of fish and other species. It looks beautiful in offices and at home because of its unique and sleek design. It adds décor to our home. It is made of scratch-less material.

It has an LED lighting feature that gives a natural look to our aquarium. It also gives an illuminating view of the entire space. The LED light is attached to the hood of the aquarium which gives a daylight effect.

This tank gives a large environment to fish. We can keep a huge verity of fish in this tank due to its large place. It keeps the temperature maintain and that’s why it is a good option for tropical fish keeping.

This product includes a kit that has different features like Aqua safe, one artificial boxwood plant mat, Tetra mini UL heater, tetra 20 Filter and four artificial plants.

Tetra introduces this tank with a tetra whisper 20 filter which has a quiet and beautiful water flow system. It cleans the tank easily and reduces are the workload.

This product is the best option for fish keepers. It has a unique and sleek design which gives a large environment to fish. We can keep a huge verity of fish in this tank.

It enhances the beauty of our homes and offices. Its LED lights give a daylight effect to this aquarium. It comes along with a starter kit that helps the user in its set up process.

The LED lights of this tank have only one setting. The night setting is not available.

4. Marina Led Aquarium Kit

This tank comes with a heavy filtration system with a marina S20 clip-on filter. We can easily change its cartridges which help in the cleaning process.

Marina usually manufactures a product with a LED feature. Same as this tank also comes with a natural day light LED effect which gives a natural look to our aquarium.

This kit comes along with fish food. It is a good option for beginners because they can get knowledge of what species like to eat and what is healthy for them.

Marine features a unique and modern design for beginners. This tank has a sleek design with a natural look. It enhances our home and office decor.

It has a tank capacity of 5 gallons, 10 and 20 gallons. We can choose it according to our species.

It is a worth buying product that comes with many features. It enhances the beauty of our home and offices because of its design and natural look.

The glass quality of this product is not too much refined.

5. Aqueon Led Aquarium Kit

This product has a low full hood profile which contains vibrant cool LED lightning. This feature gives our aquatic environment a life.

It has a quiet flow 10 LED pro power filter which has a Red LED light that flashes to indicate when it’s time to change the cartridge.

It has a Preset Heater which keeps the temperature of the aquarium constant 78 degrees. This feature is best for Tropical fish.

This product includes a complete Setup Guidance book, which includes complete procedure to set up the tank.

It has a complete Aquarium kit which includes Power filter with the medium cartridge, Premium fish food, Water conditioner, Fishnet, and a stick-on thermometer.

It is a complete package for fish lovers. It has a kit that includes many features. It is easy to set up because of its set up guidance.

Its LED hood light does not work properly.

20 Gallon Fish Tanks: Buyer’s Guide

We can get a variety of choices of species for 20 gallons. It is a cheap product and can easily manage with our pocket money. It does not take much space to put on. We can easily keep it in a small space area with a great look.

1. Community Tank

While buying an aquarium, everyone wants to build a community tank. A type of aquarium in which every variety of species can live together comfortably.

If you’re going to develop your 20-gallon tank as a community tank, then we must keep some following points in our mind :

  • We must hold those fish together who have the same body temperature and the same water capacity.
  • Only if the needs and behavior of some species are the same, then they can live comfortably together.
  • Aggressive behavior fish cannot spend their time with any other fish. Adding them to a community tank creates disaster.
  • If you are keeping schooling fish in your tank, then they must be in groups.

2. Stock Collection

Having a great collection of species makes a tank more beautiful and amazing. If we buy an excellent selection of species for our tank, and the appearance of our tank increased differently. Some best and suitable species for 20 Gallon tank are listed below:

  • Platies
  • Rainbow kribensis
  • Panda cories
  • Neon Tetra
  • Cory Catfish
  • We can use this species easily in our 20-gallon tank.

3. Shapes

There are two shapes of 20 Gallon tanks. We can choose it according to our needs. The first shape is High, and the second shape is long.

High shape aquarium is best for Mild water fish because they need extra room for their living.

Long Shape: Aquarium is best for those fish who love to swim in the top area of the tank and live on the bottom of the tank. We must choose the size and shape according to our species needs.

4. Filtration

After choosing the shape of your aquarium, the next step to get noticed on is the Filteration system. We must have to select the best filter for our tank so that our fish can live more healthy. There are different types of filters with different functions.

Hang on the back filters is the type that is placed at the back of the aquarium. The best one, according to our choice, is Tidal 35.

Internal Filter gives the best filtration system. They are placed in the interior of the tank. They have an easy setup with a quiet flow of filtration.

Spong filtrations are one kind that is put in the tank in the force water with the help of a sponge to get filtered. They are high biofilters which are cheap and easy to maintain. We can easily choose the filtration system according to our needs.

5. Heater

The other essential equipment for a tank is a Heater. We have to maintain the tank temperature according to our species body temperature.

If you are choosing a heater than it must have some features like a sensor to shut off, an indicator that shows its temperature and a temperature dial that helps us maintain the temperature.

  •  Some of the best heaters for 20-gallon tank are listed below:
  • Neo-Therm Aquarium Heater – Cobalt Aquatics 100 Watt.
  • Finnex Electronic Controller Aquarium 100 Watt.
  • EheimJager Submersible Aquarium Heater 100 Watt.
  • Aqueon Pro Heater Aquarium Heater 100 Watt.

6. LED Lights

A lot of variety of LED lights comes across our mind when we are choosing LED lights for our tank. We can light up our tank with different types of LED Light, which has quality features.

A 24 to 28 inch LED light will be best and suitable for a long 20 Gallon aquarium, and 20 to 22 inch light would be ideal for a high 20-gallon aquarium. The best-LED Light for 20 Gallon tank is Finnex Stingray LED Light.

How to Set Up a 20 Gallon Tank

If you are setting up a 20 Gallon Aquarium, we must keep the following steps in mind.

  1. First we have to notice the place where we are placing our tank. We must put the aquarium on a flat surface where the yank gets equal support from all ends.
  2. After that, we have to rinse the substrate. Which we are using for our tank because the substrate contains a lot of dust. It creates a lot of mess.
  3. Place all the equipment of the tank very clearly and masterfully.
  4. After that, if we want to decorate our tank with plants and rocks, then we should add it after the equipment.
  5. Fill up the tank with water. We should take notice that filling the water process should be slow so that the substrate of the tank must not dig up.
  6. Light up the tank with all the LED lights. We should adjust them properly.
  7. A few days maintain the temperature of the tank, and then start adding species.


Our content will quickly guide you from all the details and essential needs of 20 gallon tank. We can buy it easily while having a look at the headings mentioned above.

You should never skip the equipment for your tank. The best species should be chosen for this tank if we want to give it a beautiful look.

In the vast market, different brands are manufacturing different 20-gallon aquarium. We must buy the one with all the beneficial needs.

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