The Fish Guru

Choosing the Right 20-Gallon Fish Tank: A Complete Guide

20-Gallon Fish Tanks: Which One to Choose? If you’re new to the world of aquariums, starting with a 20-gallon tank is a great way to begin your journey as an aquarist.

This size offers plenty of space to create a beautiful aquascape, and is a great option for both beginners and experienced hobbyists looking for a second (or third) tank. However, with so many options available, choosing the right 20-gallon fish tank can be challenging.

In this article, we’ll take a look at the best 20-gallon fish tanks available, as well as some ideas for stocking them.

Best 20-Gallon Fish Tanks

1. Tetra ColorFusion Aquarium

The Tetra ColorFusion Aquarium is a complete kit that includes everything you need to get started, including a lifetime warranty.

The tank features artificial plants and a built-in filter system that helps keep the water clean and healthy for your fish. One of the standout features of this tank is the color-changing LED lighting that creates a captivating visual display.

2. SeaClear Acrylic Aquarium

Acrylic aquariums are known for their clarity of view, and the SeaClear Acrylic Aquarium is no exception.

The rounded corners add a touch of elegance to the tank, and the acrylic material is far less prone to cracking or breaking than glass. This tank is available in several sizes, but the 20-gallon option is perfect for those just starting out.

3. Landon 60P 17.1-gallon Aquarium

The Landon 60P 17.1-gallon Aquarium is a custom-designed tank made of low-iron glass for excellent clarity.

The tank features sleek lines and minimalist design, making it perfect for modern home dcor. This tank is a bit smaller than other options on this list, but it’s a great choice for those looking for a high-quality, beautiful tank.

4. Coralife LED Biocube Aquarium

The Coralife LED Biocube Aquarium is a versatile option that’s suitable for both freshwater and saltwater setups.

The LED lighting is energy-efficient and creates a natural, daylight-like effect that’s great for plant growth. The built-in filtration system helps keep the water clean, and the tank is easy to set up and maintain.

5. Life 15 Aquarium with LED Light

The Life 15 Aquarium with LED Light is a stylish tank that boasts a remote-controlled lighting system.

This innovative feature allows you to change the lighting color and intensity to match your mood or the time of day. The tank’s concealed filter system keeps the water clean and healthy, and the tank’s sleek design makes it a great conversation piece.

Ideas for Stocking a 20-Gallon Tank

Now that you’ve got your 20-gallon tank set up, it’s time to start thinking about what to put in it. The key to successfully stocking a fish tank is to research before you buy.

Here are some factors to consider when selecting fish for your tank:

Compatibility: Choosing fish that are compatible with each other is crucial for a harmonious community tank. Some species may be aggressive or territorial, while others may prefer different water parameters.

Size: Be mindful of the adult size of the fish you want to put in your tank. Some fish may be small and cute at first, but could eventually grow too large for a 20-gallon tank.

Water parameters: Different fish species require different water parameters, such as pH, temperature, and water hardness. Be sure to choose fish that have similar water requirements.

Diet: Some fish are carnivores, while others are herbivores or omnivores. Choose fish that have similar dietary needs to avoid conflicts.

Preferred habitat: Some fish species prefer to live near the surface, while others prefer the bottom of the tank. Choosing fish with similar habitat preferences can help prevent conflicts.

Swimming space: Make sure to consider the swimming space requirements of each species. Some fish may be active swimmers and require more space to swim in.

Here are some ideas for stocking your 20-gallon tank:

Nano Fish: Guppies, Platies, Mollies, Swordtails, Neon Tetras, Zebra Danios, and Harlequin Rasboras are all excellent options for a 20-gallon tank. These species are small and peaceful, and can be kept in groups of 6 or more.

Small Fish: Cherry Barbs, Celestial Pearl Danios, Endler’s Livebearers, Pygmy Corydoras, Ember Tetras, Celestial Pearl Danios, and Chili Rasboras are great choices for a 20-gallon tank. These species are small and colorful, and can thrive in a community tank.


A 20-gallon tank is a great option for beginners and experienced aquarists alike. By doing your research and stocking your tank with compatible species, you can create a beautiful and healthy community of fish.

Remember to choose the tank that best suits your needs and preferences, and enjoy the rewarding experience of owning an aquarium. As mentioned before, 20-gallon tanks are a great way to start your journey as an aquarist.

They are suitable starter aquariums for beginners, and even experienced hobbyists like using them as second or third tanks. Here are some benefits of using a 20-gallon tank:

Suitable Starter Aquarium

Beginner aquarists might prefer a 20-gallon tank as it is easier to manage than larger tanks. It’s fairly simple to maintain a good water balance while keeping the tank clean and healthy for your fish.

The 20-gallon tank is large enough to allow for a small, happy and healthy fish community. Also, stocking a 20-gallon tank can be a lot more cost-effective when compared to larger tanks.

Range of Species

A 20-gallon tank can accommodate a range of species such as small fish, nano fish, and some invertebrates. The wide range of specimens that coexist well in a 20-gallon tank is due to the available swimming space and water volume.

Contrary to popular belief, aquarists can keep a healthy mix of species in a 20-gallon tank.

Easy to Maintain

Maintaining a 20-gallon tank is easier than larger tanks. They require less time and energy to keep the water clean.

Less work also implies that the owner has more time to enjoy the fish. In a 20-gallon tank, water evaporates slowly, thus needing fewer top-ups, and fewer changes are necessary.

The filtration and lighting systems in a 20-gallon tank are also simpler in design, and they can be adjusted or customized easily.

Choosing The Right Tank For You

There are several types of 20-gallon tanks to choose from- complete kits, standard tanks, and custom-designed aquariums.

Complete Kits

Complete kits are the perfect choice for those who want everything they need in one package. This includes filters, lights, and the tank itself.

They are usually easy to set up, and the cost can be more affordable than purchasing individual components.

Standard Tanks

Standard tanks consist of just the tank itself and are suitable for those who want to customize the lighting and filtration systems according to their preferences. They come with a relatively lower price tag than complete kits.

Custom Designed Aquariums

Custom-designed aquariums are specially made for you by aquarium businesses. These aquariums are unique, often made of high-quality materials, tailored to suit your desired layout and specifications, and have more options for customization.

Custom-designed aquariums, however, can be expensive, especially if you require professional installation.

Ordering Online

Online shopping provides a quick and convenient way to order your preferred 20-gallon tank. Furthermore, shopping online offers a wider range of varieties of fish tanks to choose from with various price ranges, with delivery to your doorstep.

Be sure to order from certified dealers and suppliers to prevent fake products or fraudulent sites. In conclusion, 20-gallon tanks have unique advantages that make them popular among beginner and experienced aquarists.

They are small, yet big enough to have fun with several species in it. Also, they are relatively easier to maintain and can range from the full-package kits to custom-designed options.

Finally, with the option of online ordering, anyone anywhere can purchase the perfect 20-gallon tank. In summary, this article has highlighted the benefits of using a 20-gallon tank as a starter aquarium, the different types of 20-gallon tanks available, including complete kits, standard tanks, and custom-designed aquariums, as well as the convenience of online shopping when buying 20-gallon tanks.

By choosing the right tank, doing proper research before stocking, and understanding the unique benefits of a 20-gallon tank, beginner and experienced aquarists can create a beautiful, healthy, and affordable aquascape. Whether you are looking to start a new hobby or add an additional tank to your collection, 20-gallon tanks are an excellent choice.

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