Top 15 Best 20 Gallon Fish Tanks in 2023 (Recommended) (2024)

Searching for the best beginner fish tank to jump-start your aquarium hobby? They do not call the 20-gallon fish tank the “best beginner-friendly aquarium” for nothing.

After all, a 20-gallon tank has enough space to host a beautiful collection of fish. Even better, it is a whole lot easier to maintain compared to smaller aquariums, like a 5-gallon fish tank.

And, while it is known as a newbie tank, it is also a terrific choice for experts who are breeding or keeping a special fish breed.

Finding the 20-gallon fish tank, however, may not be an easy feat, especially if it is your first time to shop for an aquarium.

With hundreds of aquariums and equipment available, it can be somewhat overwhelming to find the best 20-gallon fish tank for your indoor space.

Plus, it can be a bit time-consuming to research as well as compare options without a clue on what this aquarium is and how many fish it can fit.

So, allow me to answer all these questions and highlight a buying guide to help you score the best 20-gallon fish tank kit.

Why You Should Buy A 20 Gallon Fish Tank?

Newbies, for the most part, buy a 10-gallon fish tank to start their aquarium journey. But, the truth is, a 20-gallon fish tank is a much better option for those who are new to fish keeping.

Take note that the larger the aquarium, the easier it is for you to keep the tank water chemistry and levels stable.

Plus, most 20-gallon aquariums are sold as kits, complete with everything you need to kick-start your fish tank hobby.

The best 20-gallon fish tank set or kits typically include a water filter, lighting system, water pump, skimmer net, water conditioner, and heater.

For experts, a 20-gallon aquarium makes the perfect quarantine tank for a new fish. Moreover, it can be used as your hospital aquarium if you need to treat a finned pet away from your community tank.

And, with its appropriate size, it can be used as breeding tanks and small biotope aquariums.

What Fish Types Can I Put In A 20 Gallon Fish Tank?

There are dozens of fish types that you can put in a 20-gallon fish tank. To make it a little simpler on your end, I have listed down a few of the most popular fish for 20-gallon aquariums.

Platy

You will love having a handful of platies in your 20-gallon aquarium. They are active and just so fun to watch.

Platies come in impressive varieties, especially the Mickey Mouse platy with its iconic mouse-like ears.

Corydoras

These bottom scavengers are definitely a lovely addition to your 20-gallon fish tank. They are small and will help keep your aquarium clean by eating the leftover food that falls to the tank’s bottom.

Since they are shoaling types, you should keep around six of them in your aquarium.

Dwarf Gourami

Dwarf gouramis are mostly peaceful and utterly beautiful fish. While they are slightly aggressive, they still make terrific community fish for a 20-gallon fish tank.

Harlequin Rasbora

These are vibrant and pretty fish that must be kept in a school of around 6. They have vibrant red or orange colors that look mesmerizing in contrast to the fish’s black sides.

Swordtails

Although sleeker and slimmer, swordtails are, when it comes to behavior and appearance, pretty similar to the platy. Moreover, these fish are peaceful and harmless community fish.

Mollies

Mollies are available in several varieties, including the black molly, marble molly, lyretail molly, and sailfin molly.

Fancy guppies

Fancy guppies are, no doubt, some of the brightest and prettiest fish you can stock in your aquarium. And, though they are incredibly active, these fish are, in general peaceful.

Zebra Danio

These zebras are hardy small striped fish. Although they look a bit like tetras, they are in reality minnows. They are among the best and most recommended tropical fish for newbies since they are so easy to maintain.

Furthermore, they are so active and provide a ton of fun in your aquarium.

Best 20 Gallon Fish Tank Comparison Chart 2023

Eager and excited to see my pick for the best 20-gallon fish tank? Before we dive into that, let us take a look at the top contenders for the title.

Which Are The Best 20 Gallon Fish Tanks To Buy?

Not all 20-gallon fish tanks are created equal. Some have innovative designs, and others are built to last for decades.

So, if you are searching for a more specific 20-gallon tank, check out these suggestions.

• Best Overall – Marina Led 20-Gallon Fish Tank
  “From its clip-on S20 filter to its Fluval water conditioner, this 20-gallon fish tank has a host of incredible features to make fishkeeping painless and easy.”
• Best Budget – Carolina Biological 20-Gallon Fish Tank
  “This wallet-friendly 20-gallon standalone tank is extraordinarily sturdy and has exceptional quality, making it a superb base to create your personalized tank setup.”
• Best Acrylic Aquarium – Seaclear 20-Gallon Fish Tank Combo
  “A perfect alternative to the quintessential glass aquarium, this acrylic tank wows aquarists with its incredible strength and striking design.”
• Best for Beginners – Tetra Complete 20-Gallon Fish Tank Kit
  “Perfect for newbie aquarists, this Tetra product is a complete aquarium kit with a filter, heater, and a hood with outstanding LED lights.”
• Best in Design – Marineland Half Moon 20-Gallon Fish Tank
  “With its half moon shape and dazzling LED lights, this fish tank will certainly spruce up any indoor space.”
• Best Aquarium for Reptiles – Tetra Reptile 20-Gallon Fish Tank Kit
  “Not only is it perfect for turtles and reptiles, but it is also suitable for fish, and is complete with all the essentials needed for a successful tank.”
• Most Visually Stunning Aquarium – Glofish 20-Gallon Fish Tank Kit
  “Famous for its neon glow, this 20-gallon aquarium has blue LED lighting that can create a mesmerizing glow in your tank.”
• Most Durable – Aqueon Led 20-Gallon Fish Tank Kit
  “Made in the United States, this 20-gallon fish tank kit is incredibly long-lasting, thanks to its sturdy construction.”

Reviews Of The Best 20 Gallon Fish Tanks in 2023

Nothing offers a better insight into a product than an unbiased review from an actual user. And, luckily for you, I have rounded up my personal reviews of the best 20 gallon fish tank kits in one place.

1. Best Overall: Marina Led 20-Gallon Fish Tank

Marina LED fish tanks are famous for their durability and superior quality. They are long-lasting and totally worth every penny. And, one of their top offerings and products is their 20-gallon aquarium kit.

Ideal for novice aquarium hobbyists, this 20-gallon tank kit has all the essentials and crucial accessories to keep a healthy aquatic environment.

For instance, the aquarium comes with a superb clip-on filter that helps maintain the water quality and chemistry of your aquarium water.

Plus, it has an LED lighting fixture that creates a natural and wondrous daylight effect.

On top of it all, the kit has a bunch of other handy add-ons, including a soft mesh fishnet and a water conditioner.

Key Features:

• Superb filter
• Complete kit
• Superior quality materials

Product Specifications:

2. Best Budget: Carolina Biological 20-Gallon Fish Tank

You will love this 20-gallon fish tank! Aside from its terrific price, this fish tank also has a sturdy construction.

While it is simple, this fish tank provides you an excellent base to build a personalized aquarium setup.

The aquarium gives you the absolute freedom to pick the equipment and accessories that you want to include in your tank setup.

You may turn it into a premium quality and sophisticated aquarium by adding top-of-the-line filters and heaters. Or, you may keep it quite simple if you are only searching for a quarantine-type aquarium set up.

It is a finely made glass tank with a super sturdy bottom. Every side is joined together using a silicone rubber. Trust me, it is built to last for several years.

Key Features:

• Sturdy design
• Perfect option for customization
• Will last for years

Product Specifications:

3. Best Acrylic Aquarium: Seaclear 20-Gallon Fish Tank Combo

The SeaClear 20-gallon fish tank is a remarkable alternative to a traditional glass aquarium. It is lighter in weight and is surprisingly more durable than some glass tanks.

Not to mention, it is less vulnerable to chipping or cracking.

And guess what? The aquarium is available in several different shapes and sizes. Their 20-gallon aquarium is available in both a hexagonal shape and rectangular shape. Additionally, this kit comes with a 15-inch light fixture and a reflector.

Key Features:

• Suitable for freshwater and saltwater applications
• Impact-resistant
• Lightweight

Product Specifications:

4. Best for Beginners: Tetra Complete 20-Gallon Fish Tank Kit

When it comes to beginner-friendly kits, nothing tops this 20-gallon aquarium from Tetra. Perfect for amateurs, this complete starter’s aquarium kit contains a 20-gallon tank, a filter, a heater, and a hood with LED lights.

Even better, the kit includes 4 artificial aquarium plants that are ideal for newbies who are planning to eventually take care of live plants.

Of course, this one is easy to set up. Truthfully, all you have to do is add the substrate, pour the treated tap water, and put the fish. Easy!

Key Features:

• Scratch-resistant glass
• Whisper filter
• LED hood
• Artificial plants

Product Specifications:

5. Best in Design: Marineland Half Moon 20-Gallon Fish Tank

With its extraordinary half moon shape, this fish tank is indeed an Instagram-worthy decorative piece that will add more flair and style to your room. And, it has an extra clear glass that creates a soothing ambiance as well as highlights the charm of your aquarium decor and fish.

I also love the LED fixture, which has 3 blue and 42 white LEDs.

The LED lighting system has 3 modes: off, on, and moonlight (blue). We love the blue light effect since it mimics the moon and provides stunning lighting effects on your aquarium.

Key Features:

• One-of-a-kind design
• Natural shimmering LED light effects
• Clear canopy (plastic)

Product Specifications:

6. Best Aquarium for Reptiles: Tetra Reptile 20-Gallon Fish Tank Kit

The Tetra reptile aquarium is indeed a terrific pick, as it is jam-packed with features and accessories that every hobbyist is looking for in a reptile tank.

And, while it is mainly designed for turtles and reptiles, it is a decent option for finned pets as well.

The kit contains all the crucial accessories, including a waterfall filter.

In addition, it contains a basking platform inside for your pets. And did I mention that it has an elegant and sleek design that will improve your room’s aesthetics?

Key Features:

• Complete fish tank kit
• Durable
• Easy on the eyes

Product Specifications:

7. Most Visually Stunning Aquarium: Glofish 20-Gallon Fish Tank Kit

The Glofish aquarium set is a heavy-duty and quality kit that can give you excellent value for your money. The aquarium kit comes with LED lighting and a filtration system, which are crucial in every 20-gallon fish tank setup.

To me, the filtration system of this kit is, hands down, one of the best add-on aquarium filters. It keeps the water spotlessly clean and creates a healthy and thriving environment for your finned pets.

Moreover, it has a blue LED light fixture that magically transforms your aquarium into a stunning and vibrant aquatic wonderland.

Key Features:

• Unique blue LED lights
• Colorful gravel and additions
• Has all the aquarium essentials

Product Specifications:

8. Most Durable: Aqueon Led 20-Gallon Fish Tank Kit

The Aqueon LED 20-gallon fish tank kit practically has everything you need to jump-start your aquarium hobby. Not only does it feature a hood with LED lights, but it has a powerful 3-stage filter as well.

Not to mention, the 20-gallon fish tank is made of sturdy and long-lasting glass.

As a bonus, the aquarium kit comes with a heater and handy additions, such as a water conditioner and fish food.

With the Aqueon LED 20-gallon fish tank, you can start keeping fish quickly and effortlessly.

Key Features:

• Comes with a heater
• Powerful filter
• Complete set
• Super durable

Product Specifications:

9. Led Tetra 20-Gallon Fish Tank

The Tetra LED 20-gallon fish tank is another complete starter’s kit hardwired for anyone who wants to venture into the world of fish keeping. Like most of the best 20-gallon fish tank kits, this package has everything you need to set up an aquarium quickly, even if you are a newbie.

As a matter of fact, the kit comes with a bunch of decorations and artificial plants, meaning you do not have to purchase these things separately. Plus, it has a white piece of anemone that certainly adds more aesthetic appeal to your aquarium. Of course, it gives your pet a place where they can hide and relax.

Key Features:

• Mesmerizing LED glow
• Complete kit
• Contains anemones

Product Specifications:

10. Innovative Marine 20-Gallon Fish Tank

Looking for a saltwater aquarium option? The Innovative Marine aquarium is the ultimate 20-gallon fish tank for those who are planning to keep seawater and marine creatures.

An ideal beginner’s aquarium kit, this fish tank includes a bunch of other accessories, including mesh screen cover, filter sock, and return pump.

To me, it is incredibly durable, thanks to its thick 6mm high-clarity glass and low iron. I also love its return pump, which flows around 326 gallons per hour.

Key Features:

• High-clarity and sturdy glass
• Rubber level mat (pre-installed)
• Strong DC pump

Product Specifications:

11. Seapora High 20-Gallon Fish Tank

Do not have a ton of room at your home for a standard rectangular fish tank? Why not invest in a horizontally-designed Seapora high 20-gallon fish tank?

Not only will it save some space for your indoor space, but it is incredibly durable as well.

It uses premium quality silicone on its sides to keep the aquarium leak-proof as you fill it up with fish and water.

And, the aquarium holds up pretty well, thanks to its injection molding.

I also love its edges, which were polished beautifully by diamonds, making it look fabulous and elegant for most rooms.

Key Features:

• Made 100% in the United States
• Premium quality black silicone
• Molded frames

Product Specifications:

12. Aq Ascent 20-Gallon Fish Tank

If you are looking to add more visual appeal to your home, you should consider Aq Ascent as one of your top options. Its extraordinary design, paired with its crystal clear glass, makes a wondrous aquarium setup.

Truthfully, I prefer to use it as a centerpiece for my indoor space.

And, the aquarium comes with a mishmash of essentials and necessities to start your aquarium hobby. For one, it has a QuietFlow filtration system to clean your aquarium of fish debris silently.

Moreover, it uses an LED light fixture to make your aquarium look more enthralling.

Key Features:

• Frameless
• Wondrous contemporary design
• Complete kit

Product Specifications:

13. Marineland Aquaria 20-Gallon Fish Tank

They do not call this Marineland aquarium as one of the best 20-gallon fish tank kits for nothing. After all, it is a complete kit that has all the necessities to help you kick-start your aquarium hobby.

It has a superior and powerful filtration system that has been a trusted option, for years, in the world of fish keeping.

Another cool feature that I admire is its sophisticated LED lighting system. Unlike other aquarium lighting fixtures, it has blue and white LED settings that mimic nighttime and daylight.

And, did I mention that it has a net, fish food, thermometer, and a heater?

Key Features:

• Made in the US
• Complete set
• Sophisticated features

Product Specifications:

14. Coralife Led Fish Tank

Want something a little different? Here is a wondrous and extraordinary 20-gallon fish tank that you should consider.

An exceptional and high-quality tank, this option is suitable for freshwater and saltwater use. And, it has a wondrous design that makes a standout among other aquariums.

Furthermore, it comes with a vibrant LED lighting system with a trio of settings: color enhancing, bright blue, and bright white.

Even better, it has a 24-hour timer that mimics the natural cycle of a day. It has a built-in filter system that helps maintain a healthy and thriving aquatic environment.

Key Features:

• Sleek contemporary hood
• Automatic LED settings
• Quiet pump

Product Specifications:

15. Aquarium Masters 20-Gallon Fish Tank

Do you already have a bunch of equipment and accessories for your tank? Then, you might want to consider buying this reliable and long-lasting tank.

It does not easily chip and is made of incredibly durable materials. And, the aquarium lets you see easily what is inside, thanks to its distortion-free glass.

Also, this aquarium is ideal for both marine and tropical fish.

With its black frame and silicone sealant combination, it helps avoid leakage from inside the aquarium. And, it can fit different types of aquarium lighting setups.

Key Features:

• Fits a variety of filters and lighting systems
• Polished diamond edges
• Distortion-free aquarium glass

Product Specifications:

Buying Guides

Cannot make a decision? Need some help finding the best 20-gallon fish tank?

Well, guess what? Here are a few tips that will help you pick the 20-gallon fish tank for your indoor space.

Stick To Your Budget

Look around before you buy one. And, always keep an eye out for promotions. Trust me, it is so easy to get carried away and surpass your budget in this kind of hobby.

You should start small and with the minimum. Then, keep building up the aquarium equipment as your knowledge and experience progress.

Glass Or Acrylic?

There are a couple of primary materials used to build fish tanks: acrylic and glass.

Each material has its own pros and cons, and your choice will depend on your budget and personal preference.

Glass aquariums – the traditional versions – are more expensive than acrylic since it is more durable. Also, it will remain pretty clear, even after years of use.

It is also heavier than their acrylic counterparts.

If you are on a tight budget, you should consider buying an acrylic tank, as it is a cheaper option. It is made of clear, lightweight, thin, and sturdy plastic. But, it can turn opaque and yellow after a while.

Space

Do you have enough space in your hall or room for the fish tank? Take note of the tank’s dimensions before you purchase it.

Keep in mind that 20-gallon fish tanks have different shapes, designs, and dimensions.

Also, see if you have enough room for the aquarium and a sturdy spot to install your tank.

Kits Or Standalone

Today’s 20-gallon fish tanks usually come in all-in-one sets or kits. And, these kits can come in handy for those who are just starting out.

With an aquarium kit, there is no need to research every piece of equipment that you need to get your tank going.

If, however, you already have some aquarium equipment, you should consider buying a standalone fish tank.

Accessories And Features

Planning to buy an all-in-one 20-gallon fish tank kit? Then, make sure to take a more in-depth look at what is inside the package.

Do not forget to figure out the purpose of every accessory and buy anything that is not included in the package.

The kit will likely include a lighting fixture, filtration system, a couple of decorations, and maybe a heater.

Frequently Asked Questions

Got a question about fish and 20-gallon aquariums? Maybe, you will find some answers on our FAQ section.

What are the best 20-gallon fish tank brands?

Always go for a reputable and well-known brand when buying aquariums. Take note of these brands, as you look for the best 20-gallon fish tank.

• Sea Clear
• Marineland
• Marina
• Tetra
• Aqueon

How much does it weigh?

In general, a 20-gallon fish tank measures around 24 by 13 by 16 inches. With these dimensions, a 20-gallon glass aquarium will weigh around 177 pounds.

And, if you are going to fill the tank with freshwater, it will be around 181 pounds.

An acrylic aquarium, on the other hand, weighs 167 pounds when filled with fresh water and 171 pounds with saltwater.

How much substrate do I need for my 20-gallon aquarium?

Experts recommend a pound of substrate for each gallon of aquarium water. That means you need 20 pounds of gravel or any substrate for this aquarium size.

Do I need a stand for this aquarium size?

A 20-gallon fish tank will need a reliable and sturdy to support its weight. Trust me, an aquarium of this size cannot just sit on any furniture piece.

Can I put shrimp and snails in a 20-gallon fish tank?

It will be very beneficial to put shrimp and snails in your aquarium since they eat most of the tank’s algae and fish food leftovers.

What plants work best in 20-gallon aquariums?

If you want to put live plants in your aquarium, consider adding Hornwort, Crypts, Java moss, Anubias, and Amazon swords.

My Top Pick

There is absolutely no shortage of options when it comes to 20-gallon fish tanks. But, if I have to pick only one, it would be the Marina LED 20-Gallon Fish Tank.

Whether you are a fishkeeping amateur or an experienced aquarist, this 20-gallon aquarium will not disappoint you.

It is made of premium quality glass and contains all the crucial tools and accessories for a successful fish tank setup.

And it is inexpensive and energy-efficient too!