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Best 20-Gallon Fish Tank Kits 2021 -Top 8 Ultimate Reviews

Being a fish enthusiast is a wonderful hobby that brings joy into your home. There is a large variety of fish to choose from that come from all over the world. Before you can start taking care of fish, you are going to need somewhere to keep them.

To help you get started on your new hobby we have found 8 of the best 20-gallon fish tanks. Below we review each one of these tanks to let you know just what to expect. We even list out both the pros and the cons so you can choose the perfect tank.

Best 20-Gallon Fish Tank Kits Review


Top 8 Fish Tank Kits

1 Marina LED Aquarium Kit

The Marina LED Aquarium Kit is perfect for beginners to get started with. This 20-gallon aquarium comes with everything you need to jump start your new tank. This tank is made of glass instead of plastic to give you a crystal clear view of your fish.

 To start off with, the Marina Kit comes with a filter that fits onto the tank perfectly. You will receive the Marina Slim S20 with your kit. This filter is perfect for keeping your new aquarium clean. The S20 features quick-change cartridges so that you can keep your filter running easily.

This aquarium comes with an LED light that is integrated into the canopy of the tank. The LED lights represent natural daylight to your fish. When it gets dark you can simply flip the switch to turn the light off. The light will both enhance your habitat and make your tank look gorgeous.

You will also get a bottle of Fluval Max Fish Food to try out. Along with this, you will receive a bottle of Fluval Aqua Plus Water Conditioner to make the water safe. A biological supplement will also be included in your order to help nurture healthy bacteria in your tank.

Lastly, you will receive a fish net to assist with cleaning and a helpful guide book. The guide book will give you tips on maintaining your aquarium.

Marina LED Aquarium Kit
Our rating:4.2 out of 5 stars (4.2 / 5)

  • Built-in LED Light
  • Guide Book
  • Easy Set-up
  • Loud Filter
  • LED Can’t Grow Plants

2 Tetra 20 Gallon Complete Aquarium Kit w/Filter Heater LED & Plants

 The Tetra 20 Gallon Kit is another great starter kit for setting up a new tank. This kit comes with everything you need to get started plus a few extras. The aquarium is made of scratch resistant glass. This guarantees that you will have a clear view of your fish for years to come.

This is one of the top rated 20-gallon fish tank kits out there. This is thanks to the amount of included extras Tetra give you to get started. To begin, you will get a filter with your purchase to help keep your tank clean. The filter model you will receive is the powerful Tetra Whisper Filter.

Along with the filter, you will also receive a heater that is perfect for helping you keep tropical fish. The Tetra Mini UL Heater is the perfect companion for this model of tank. In addition, this aquarium also has an LED installed in the hood that gives your fish some light during the day.

The extra accessories will include a set of artificial plants. These plants are meant to help mimic the natural look of the sea. These provide a great place for your new fish to hide while adjusting to the tank. The kit also provides a Boxwood plant mat to help with the decoration.

Tetra tanks come with a lifetime warranty to give you peace of mind. If you have problems with your tank contact Tetra at any time for a replacement.

Tetra 20 Gallon Complete Aquarium Kit w/Filter Heater LED & Plants
Our rating:3.8 out of 5 stars (3.8 / 5)

  • Heater
  • Lifetime Warranty
  • Scratch Proof Glass
  • One Temperature Heater
  • Loose LED Light

3 SeaClear Acrylic Aquarium Combo Set

The SeaClear Acrylic Set is made to look particularly stunning in your home. The aquarium is made out of incredibly clear acrylic that is easy to see through. In fact, there is acrylic everywhere on the aquarium minus the lid. This leads to a nice view any way you look.

Being made of acrylic gives this tank quite a few benefits to consider. Firstly, acrylic is a stronger material than glass that weightless. This makes this a perfect choice for homes with pets or children. The tank is made to bed especially hard to break, crack, or scratch up.

Other than the tank this kit includes an electric light in the lid. The light is 15 inches long to cover the majority of your tank. The clear acrylic combined with this light makes the colors of your fish pop out. There is a switch so that you can turn the light off or on depending on your needs.

Finally, you will get a reflector with your purchase to help your tank pop. You will have to purchase a filter for this aquarium as the kit doesn’t include one. Luckily, there are plenty of filters that will work perfectly with this lovely SeaClear Acrylic Aquarium.

With this purchase, you will also receive an extensive lifetime warranty to protect your tank. This covers any type of malfunction the tank naturally has over the years.

  • Looks Beautiful
  • Durable Build
  • Flimsy Lid
  • No Filter

4 Tetra Deluxe Aquatic Turtle Kit

We know that some creatures don’t just stay in the water. Turtles are a popular aquatic pet that has specific needs. These needs are much different from that of fish. This tank was made to help you raise turtles. It contains everything you need to create your pets perfect habitat.

To start with, you will receive a Tetrafauna Decorative ReptoFilter to help cycle the water in the environment. Include with the filter is three cartridges to keep the filter cleaning properly. The Tetrafauna is made to hook on perfectly to this Tetra Tank for maximum cleaning results.

Next, you will receive 2 dome lamps to keep your turtle warm. These 5.5-inch lamps use a 60 Watt heating bulb along with a 13 Watt UVB bulb. These lights can be switched off or on to give you turtle a proper habitat. Make sure to only use the appropriate bulbs with these lights.

This kit also gives you decorative plants to liven up your tank. An aquarium background also comes with this tank to help complete your look. To cover your filter there is an include basking rock. This cover helps keep your animals out while giving them a place to warm up.

The kit also comes with various samples of Tetra products for turtles. This can help you get jump started and find out what your pet likes. As a bonus. the screen top for this tank is fitted with locks to keep your turtle inside.

Tetra Deluxe Aquatic Turtle Kit
Our rating:4.2 out of 5 stars (4.2 / 5)

  • Unique Aquarium Kit
  • Comes With Samples
  • Basking Rock Cover
  • Cheap Light Bulbs
  • Cracks Easier Than Most Tanks

5 Aqueon Ascent LED Frameless Aquarium Kit 20 Gallon

The Aqueon Ascent LED Frameless Aquarium Kit is a wonderfully unique tank that will look good in your home. The unique design of this tank combined with its clear glass design makes for a wonderful set-up. You will be able to make the tank a centerpiece thanks to its beauty.

This tank comes with several different aquarium necessities to get you started such as a filter. The filter uses QuietFlow Power Filtration to silently clean your tank of fish debris. This kit also comes with your first filter cartridge to get you through the first few weeks of fish keeping.

The cover of the Aqueon Ascent has an LED light attached to it. This light can be flipped on or off using a switch to give your fish a bit of light. The slanted design of the canopy roof gives the illusion of a full tank. In reality, though the back of the tank will have a few inches of air left.

This kit provides a fish food sample for you to try out. You will also receive water conditioner to guarantee that water you feel the tank with is fish safe. The kit comes with a handy guidebook as well, to help you get started.

Lastly, this tank provides easy access to clean your filter. This can make your life much easier when doing tank maintenance. This ease of access makes this one of the best 20-gallon fish tank kits.

  • Intriguing Design
  • Easy To Clean
  • Weak Lighting

6 Aqueon Aquarium Fish Tank Led Kit, 20 Gallon

 The Aqueon Aquarium Fish Tank Led Kit has the contemporary first tank style that we all know and love. To top it off, this tank kit is made for keeping tropical fish instead of just freshwater fish. This makes this tank perfect for anyone who is captivated by sea life’s natural beauty.

This kit comes with everything you need to start raising tropical fish including a filter. The filter is preset to be the perfect temperature for housing tropical fish at 78 degrees. While you can’t change the temperature on the 100w heater, it will work well for most any fish you choose.

Along with this, you will receive a filter to help with your tank. The filter you will receive is the QuietFlow 10 LED PRO power filter that comes with a free medium cartridge. This will be everything you need to get your tropical fish keeping off to a great start.

To go with your filter and heater the kit comes with a stick on thermometer. This will help you keep a close eye on the temperature of your aquarium. If anything goes wrong you can just check the thermometer to make sure your fish are still warm enough to survive.

You will be provided with a sample of premium fish food to try out. Water conditioner comes with this kit, as well as, a fish net. All of this together will make taking care of tropical fish a complete breeze. In addition, this tank comes with lights for your fish as well.

Aqueon Aquarium Fish Tank Led Kit, 20 Gallon
Our rating:3.7 out of 5 stars (3.7 / 5)

  • Perfect For Tropical Fish
  • Preset Heater
  • Comes With a Thermometer
  • Iffy Hood
  • Light Glare

7 Glofish 20 Gallon Aquarium Fish Tank Kit

The Glofish 20 Gallon Aquarium Fish Tank Kit is a good 20-gallon fish tank kit for beginners. Like most products from the Glofish company, this tank aims to make your fish pop. With a fun lighting system, your fish will be radiating color as they swim around in the tank.

This tank is made out of glass to let you view the vibrant colors of your fish clearly. To create this effect the aquarium has a LED light in its hood. Instead of using a normal while bulb this tank has a blue LED. This creates the glowing effect in the tank that makes your fish pop.

A filter will also come with your purchase. The filter you will receive is the Tetra Whisper 20 filter that can clean your tank without tons of noise. This tank is also great for tropical fish as it comes with a heater. The model of heater you will receive is the Tetra Mini UL Heater.

To brighten up the tank, even more, the kit includes 3 Glofish brand plants. These plants react to the blue LED and look vibrant when it’s on. The plants also provide the perfect hiding place for skittish fish. You will also receive, a Glofish brand yellow anemone made to glow brightly.

Lastly, this kit also provides both a food and water conditioner sample. The kit will also come with a helpful set-up guide to get you started. Glofish also offers separate products to enhance the glow of your tank like special aquarium bedding.

Glofish 20 Gallon Aquarium Fish Tank Kit
Our rating:3.4 out of 5 stars (3.4 / 5)

  • Brilliant Colors
  • Includes a Heater
  • Includes Plants
  • Anenome Can Tear Easily

8 Tetra 20 Gallon Complete Aquarium Kit w/Filter Heater LED & Plants

 The Tetra 20 Gallon Complete Aquarium Kit is one of the best 20-gallon fish tank kits for several reasons. For starters, it comes with everything you need to set-up a wonderful looking tank. Cosmetically it looks like a vibrant and classy tank you will be proud to display in your home.

This tank comes with a free filter and heater to help you keep things running smoothly. The filter for the tank is a Tetra Whisper 20 Filter meant to help keep things quiet. The heater you will receive is the UL Heater That can help you successfully keep tropical fish in the tank.

Next, you will receive a Color Fusion Universal Color Changing LED light. This light switches between mutiple colors to give your tank a unique stylish feel. Once you find a color you like, simply pause the tank to keep it from cycling. You can also completely turn the LED off.

Unlike some other kits, you get a few plants with this one to get you started. This includes 2 multi-packs and one white anemone for your fish to hide in. You will also receive a fish net to help you with cleaning the tank along with a digital thermometer.

Finally, you will get a few packets to try various products like water conditioner. The tank also comes with a hinged lid and a Tetra brochure to help get you started. This kit will also include one adapter.

Tetra 20 Gallon Complete Aquarium Kit w/Filter Heater LED & Plants
Our rating:3.8 out of 5 stars (3.8 / 5)

  • Comes With Plants
  • Unique Lighting
  • Faulty Lid
  • Short Tubing

How To Choose Your Fish Tank Kit

Now that you have seen the best 20-gallon fish tank kits we could find, we hope you have a favorite. If not, then you may be wondering what you should consider when picking out a fish tank. There are several different things that will affect which tank is going to be right for you.

To start with, do you want to keep freshwater or saltwater fish? Most freshwater fish aren’t going to be as temperature sensitive as the tropical fish. If you choose to keep tropical fish then you’re going to need a heater for your tank. In this case, a tank that includes a heater is perfect for you.

Best Review 20-Gallon Fish Tank Kits


Depending on the fish you want to keeps natural habitat you may need to change around a few things in your tank. For starters, do the fish you are getting live in calm water or flowing rivers. You’re going to need to have the right amount of water flow for your fish to swim around in.

If the fish you are choosing naturally live in a calm environment you will want to skip over strong filters. A filter that puts out a strong flow of water can overpower these fish leading to stress. This also goes for using a dull filter on a fish who is used to swimming against a current.

Top 8 Fish Tank Kits


To have a happy fish you will also need to think about what they need in their environment. Most fish prefer to have plants whether they be real or fake. Fish naturally hide in these plants especially ones who are generally prey. Plants can ease a scarred fish decreasing stress.

If you like the look of real plants better then you are going to need an LED with enough power to make them grow. Not every LED is strong enough to promote the growth of real plants. To find out if the light is strong enough look-up what how much light the plant will need.

If you have chosen to go with a turtle or salamander then you will need to rethink your tank altogether. This is because these animals have different needs from a fish. The tank they go in will have to have heating lamps and above water spots to crawl on.

Review Best 20-Gallon Fish Tank KitsIf your keeping a turtle you might even want to have a tougher tank then you do for normal fish. You will also need to keep in mind that turtle food and fish food don’t have the same nutrients. Lastly, You will want to make sure your turtle isn’t going to grow huge.

These are the our best 20-gallon fish tank kit reviews, there are quite a few perfect for both types of fish. Think about this guide and pick which tank fits your needs best. If you need a tropical tank then go for a heater kit, if you want a turtle then go for the reptile kit.

Picking The Perfect Tank

To truly pick out your perfect tank you will have to know what fish you are planning to put in it. Once you have chosen your perfect fish look up there care needs. If they need warm water then simply choose a kit with a heater or one that is heater accessible

Once you have narrowed down which of these tanks you like the best make a choice. These are some of the best 20-gallon fish tank kits out there. Read each review carefully to learn which one will fit into your life the best.

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