Best 20 Gallon Fish Tank Aquarium Reviews

The best thing about a 20 Gallon fish tank is that it gives the aquarist enough opportunities to explore or experiment with it. If you are looking for an upgrade from your previous fish bowl or 5 Gallon tank, then it is definitely going to hand you with plenty of usefulness.

SeaClear 20 Gal Acrylic Aquarium Combo Set Fresh & Saltwater$$$
Marineland Biowheel Aquarium Kit Fresh & SaltwaterMid $$$
Aqueon Aquarium Fish Tank Starter Kit Fresh & SaltwaterLow $$$
Tetra 20 Gallon Aquarium KitFresh & SaltwaterLow $$$
Marina LED 20 Gal. Aquarium KitFresh & SaltwaterLow $$$
Tetra Color Fusion 20 Gallon Aquarium Kit Fresh & SaltwaterLow $$$
Tetra Color Fusion 20 Gallon Aquarium Kit Fresh & SaltwaterLow $$$

What Are The Benefits Of Having A 20 Gallon Fish Tank?

Planning to buy a 20 Gal. fish tank will come with many advantages that you have ever anticipated. Not only in terms of decoration or as a beauty enhancer for your room but also it has the ability to calm your nerves.

Let’s check out some other benefits:

Enough space:

 While keeping a fish in your tank, you should always think about its swimming space as it loves to do that. A 20 gallon of fish tank will give your fishes enough room to swim and play hard.

Keeping Separate Species:

 While having a fish tank of 20 Gallon, dividing it with the help of a tank divider for keeping different species of fishes, helps you to make the best out of it.

Easy Maintenance:

 While opting for such a big tank, you do not need to worry about taking good care of the water chemistry or the continuous fluctuation of the temperature. Bigger aquariums have the ability to adjust the environmental changes so that the fishes can thrive well.

Great Upgrade:

 If you had earlier started your fish keeping hobby with a fish bowl or a 5 Gallon fish tank, then, now it seems the perfect time for you to make an upgrade with the 20 Gallons tank. It will not only give you an array of choices but also make your fishes happy to swim in bigger space.

Easy to Accommodate:

 20 Gallons of fish tanks can be availed in many shapes, which is why you can easily accommodate this tank according to your available space. So do not make space your excuse for not having such a tank full of opportunities.

Best 20 Gallon Fish Tank Reviews – 2017 Top Picks:

20 gallons are great for moderate capacity usage, and can give you a great view if used properly. You certainly have made a right choice.

SeaClear 20 Gal Acrylic Aquarium Combo Set Review

This Acrylic made aquarium is the best 20 Gallon long fish tank you can avail in the market. While choosing this tank of 24 x 13 x 16 inches from SeaClear, with its plethora of benefits, nothing can go wrong.

This aquarium combo includes a reflector and one 15 inches of electric light fixture.


  • Acrylic gives you the best durability with safe usage.
  • The tank is 17 times stronger than any glass made aquarium.
  • Impact resistant and fewer chances of chipping.
  • Safe for pets and children.
  • Both salt and freshwater can be used.
  • Top of the tank does not come off so better choice for turtles and fishes that jump.
  • The top lighting apparatus comes off revealing 5 ½ x 15 inches cut out opening to give you access to every corner of the tank.
  • Another cut out of 2 ½ x 15 inches is there to fix your filter or heater and also to feed your fishes.

Con: Buyers have reported that they would highly appreciate the combo pack if a bulb comes with it.

Things you need:

Additional equipment that you may need with this tank from SeaClear includes–

  • 1 x adequate filter with 3 or more stage filtration.
  • LED lights both for day and night effect.
  • 1 x tank heater.
  • 1 x thermometer.
  • 1 x pH Calculator. (Optional depending on the sensitivity of your fish)

Last Verdict:

If you are searching for a sturdy aquarium, then going for this 20 Gallon acrylic fish tank combo will be the right choice for you. Also to cut your costs on the equipment you can get a heater which comes with an inbuilt thermometer, as it will be less costly than buying them separately.

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Marineland Biowheel Aquarium Kit Review:

If you are planning to have a 20 Gallon fish tank starter kit with all equipment included with the pack then, this kit with 26 x 14.1 x 18.1 inches of tank from Marineland, really comes at an affordable price with great benefits.

  • 1 x Fluorescent LED lighting.
  • 1 x Updated hood.
  • 1 x Penguin bio-wheel filter.
  • 2 x Rite-size filter cartridges.
  • 1 x 200 Watt Submersible heater.
  • 1 x Thermometer.
  • 1 x Water Conditioner.
  • 1 x Fish Net.
  • 1 x 1 Food and Water Care Samples.
  • 1 x Set Up Guide.


  • The hood of the aquarium has a sleek and modern look.
  • Day and night LED lights are incorporated.
  • 3 position switch – on, blue and off.
  • Energy efficient, low voltage 60-milliwatt lighting.
  • No mercury is present in the LED lights.
  • The hinges are useful in terms of feeding and maintenance quick and easy.
  • You can attach feeding filtration and accessories in the hood.
  • Bio-wheel filter provides superior biological filtration which helps in eliminating ammonia and nitrite.
  • The filter will never clog or need any replacement. Also, needs minimum maintenance.
  • Mechanical cleaning feature of the filter screens out debris, dirt etc.

Con: With this great utility kit, comes no cons at all.

Last Verdict:

 Looking for a fish tank kit, that will come accomplished at your doorsteps? Well, you don’t need to look further. It is the best 20 Gal. fish tank kit in the market as far. The affordable pricing of the pack from a reputed company like Marineland is definitely worth buying.

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Aqueon Aquarium Fish Tank Starter Kit Review

This 20 Gal. of fish tank of 12.5 x 24.2 x 19.5 inches from Aqueon, has all the essential equipment included that a starter might need to set up an aquarium. Though gravel, décor, stand and obviously fish do not come with this kit, you can have all the required things other than these at an affordable price.

  • 1 x LED light with minimum brightness.
  • 1 x 20 Gallon fish tank hood.
  • 1 x 20 Gallon fish tank filter.
  • 1 x Water Conditioner.
  • 1 x Fish food.
  • 1 x Heater.
  • 1 x Thermometer.


  • Simple rectangle shaped glass made fish tank with sturdy built.
  • The beautiful hood of this tank is easy to adjust and remove.
  • The LED light attached to the hood is of medium brightness.
  • If you are thinking of growing plants under these LEDs, then no doubt these are absolutely capable of that.
  • The heater of the fish tank is fixed in one temperature that is 79 degrees; it is the best temperature for fishes to thrive well.
  • The filter for 20 Gallon fish tank has all the crucial features that will make the tank water safe and comfortable for the better health of your aquatic lives.
  • One bottle of water conditioner is included to control the hardness of the tank water.
  • One premium quality fish food is also added to give your fishes good physical health.
  • The simple stick thermometer is perfectly capable of telling the temperature of the underwater environment so that you can always keep track of the tank conditions.
  • The entire kit can both work as a 20 Gallon saltwater fish tank and brackish water fish tank.

Con: As the heater is fixed at one temperature, for the starter it may seem as a good feature, but for the experts, they may want a better upgrade to adjust the temperature by their own.

Last Verdict:

The best thing about this kit from Aqueon is that it comes at a really affordable rate with all the necessary equipment. So if you are looking for a kit that may be used as an upgrade from your previous smaller tank, then definitely go for this one, as it will minimize your workload of selecting various equipment compatible to your tank.

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Tetra 20 Gallon Aquarium Kit Review

Are you searching for a glass made aquarium but less prone to scratches? Then you have landed on the right aquarium review. I personally am a fan of Tetra and the glass made aquariums they made. One of the reasons behind such huge popularity of this kit among the aquarist is that it not only has the perfect array of equipment but also the tank itself is jaw-dropping.

  • 1 x sleek designed hood.
  • 1 x LED light with daytime effect.
  • 1 x Tetra Whisper 20 Filter.
  • 1 x Artificial Boxwood plant mat.
  • 4 x Artificial plants.
  • 1 x Tetra Mini UL heater.


  • The glass made aquarium is made in the USA, hence very sturdy in nature and less prone to any scratches. So basically it is kids-proof.
  • The sleek design of hood gives your tank more aesthetic look.
  • The LED light with daytime effect is perfect for your fishes so there is no need of buying any extra lights.
  • The Tetra whisper 20 filter is work very efficiently by creating bubbles in the tank also making no sound at all.
  • The quiet performance of the tank makes your fishes more comfortable in their artificial habitat.
  • The plant mat and the 4 artificial plants give you the leverage of decorating your tank completely.
  • One Tetra mini UL heater is also included with the pack so obviously, you will save more bucks unlike buying a separate heater which will definitely cost you more.

Cons: Those who are looking for a 3 stage filter, need to buy a separate one.

Last Verdict:

The kit is accomplished in every way to start your fish keeping hobby, if you want to make it more advanced then in the later times you can add some extra equipment also. But for the start, it is an ample kit with the 27.9 x 16.1 x 20.4 inches of the fish tank in affordable rate.

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Marina LED 20 Gal. Aquarium Kit Review

 Marina is my all-time favorite, because, all of the fish tank kits it offers, comes at an incredibly affordable price with a plethora of accessories. While starting a fish keeping hobby or upgrading from a smaller fish tank, nothing can replace this kit. This is the most useful kit you will have in your budget with the dimensions of 24 x 12.5 x 16.5 inches.

  • 1 x Aesthetic Canopy.
  • 1 x Marina Slim S20 Clip-on filter.
  • 1 x LED with Natural daylight effect.
  • 1 x Nutrafin Max fish food.
  • 1 x Nutrafin AquaPlus.
  • 1 x Nutrafin Cycle.
  • 1 x Fishnet.
  • 1 x Thermometer.
  • 1 x Care guide.


  • The glass made aquarium is absolutely strong and scratch-proof.
  • The canopy included with this tank is one of the best aesthetic hood in the 20 Gallon fish tanks.
  • The Marina Slim S20 clip-on filter gives you a quiet filtration process which helps your fishes to swim in a blissful environment.
  • The two cartridges of the filter, Bio-Carb, and Bio-clear contain Ceramitek which gives ample biological filtration.
  • The both cartridges come with easy to change feature.
  • The Nutrafin Cycle and Nutrafin Aquaplus water conditioners help you in the fast elimination of ammonia, nitrite and other biological pollutants to make the tap water safer for fishes.
  • The LED light incorporated in the hood will give your fishes a complete daylight effect.
  • The pack is further included with a fish net for various usage and a Nutrafin Max fish food for the better health of the fishes.
  • The thermometer included with the kit will assist you in monitoring the temperature of the tank water.
  • The care guide is provided to guide the starter in the proper care and maintenance of their fishes.

Cons: No heater is added with this kit.

Last Verdict:

All the aquariums from Marina are extremely reliable, so if you are going for this kit, then you are making the right choice. However, the absence of a heater is very prominent in this kit, but buying one separately will surely not include the extension of your budget as this entire kit is really affordable.

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Tetra Color Fusion 20 Gallon Aquarium Kit Review

Searching an aquarium that can change the entire ambiance of your living room with its beautiful color combination? Then going for the Tetra color fusion 20 Gallon fish tank of 24.2 x 12.4 x 16.7 inches, is your best choice right now in the market. Let’s take a look at its plethora of benefits.

  • 1 x Aesthetic hood.
  • 1 x UL Heater.
  • 1 x Tetra Whisper 20 filter.
  • 1 x Color Fusion Universal Color changing LED.
  • 2 x Wonderland Plant MultiPacks.
  • 1 x Blooming Anemone.


  • The sturdy glass made aquarium from Tetra is irreplaceable.
  • The aesthetic hood will add a special charm to your tank.
  • The UL heater is absolutely required to keep the temperature of the tank in control.
  • The Tetra whisper 20 filter creates beautiful bubbles during the filtration process and creates no sound to make your fishes more comfortable in their environment.
  • The color changing LED is adjustable and you can fix it at any given color.
  • The decorative stuff included in this pack helps in enhancing the underwater look of the tank.

Con: The filter is not appropriate for sensitive fishes.

Last Verdict:

To start your fish keeping hobby with an upgrade kit, no kit in the market can replace the usefulness of this Tetra aquarium kit. And the aesthetic LED light that changes color is an added advantage which you can bag with one of this cheap 20 Gallon fish tanks.

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Carolina Biological Supply 20 Gallon Fish Tank Review

 This 20 Gal. of Aquarium from Carolina Biological Supply company is your best choice of a sturdy glass fish tank. If you are looking for a highly durable tank, to set up in your room then this 24 x 12 x 16 inches of aquarium is the perfect buying decision.


  • The sides and bottom of the aquarium which are more vulnerable to damage are specially manufactured with triple strength.
  • The glass is very sturdy in nature and completely scratch-resistant.
  • The tank is manufactured with clear glass welded together with silicone rubber.
  • It is completely nonreactive to saltwater so a perfect housing for your fishes.
  • Leak-proof built will let you use it for decades.
  • The top frame is mainly designed for recessed cover.
  • Quality product at affordable price.

Con: Not added with essential equipment mainly the hood.

Things you need:

Equipment and other essential things you need at the first place to set up this tank properly:

  • 1 x 3 stage filter.
  • LED lights according to your choice.
  • 1 x tank heater.
  • 1 x thermometer.
  • pH Calculator (Optional).
  • Water Conditioner.

 Last Verdict:

If you are that buyer who believes in buying each equipment of paramount quality, then buying this aquarium will be the best decision for you. The manufacturer has left no stone unturned to make this fish tank absolutely aesthetic as well as durable.

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  • How big is a 20 Gallon fish tank? / What are the dimensions of 20 Gallon fish tank?
  • Usually, the shape of the tank will highly govern the 20 Gallon fish tank dimensions, for example, if you are buying a 20 Gallons of acrylic made aquarium which has a rectangular shape will come in 24 x 13 x 16 inches. But if you are opting for a 20 Gallon tall fish tank or a 20 Gallon high fish tank the dimensions will differ.
  •  What is the best fish for 20 Gallon tank? / What freshwater fish for 20 Gallon tank I can avail?
  • If you are searching a single species fish for 20 Gallon tank then going for Platy, Zebra Danio or Molly will be the good choices but don’t keep more than 6 – 7 in a single tank.

Or, if you are asking to suggest separate species of fish for a 20 Gallon tank then the best thing you can do is to divide the tank in two and keep 4 fishes from any two species in each 10 Gallon tank.

Bottom Line:

With a 20 Gallon fish tank, you can really experiment an array of things. From making it a hospital tank to breed livebearers in it, you can accomplish all including dividing it to two keep different species. So, in case you are still overthinking on the buying decision, just don’t, instead experience that plethora of opportunities.