Best Aquarium Filter for 20 Gallon Tank

In this article, we have reviewed the best aquarium filter for 20 gallon tank. If you are in a hurry, the table below gives a quick snapshot of the top ones.

Top Choice
Fluval C3 Power Filter, Fish Tank Filter...
Second Choice
Penn-Plax Cascade Hang-on Aquarium...
Best Value
Marina S20 Power Filter
What's good?
5-stage clip-on power filter, Two mechanical stages trap large and fine debris, Chemical stage removes toxins, Biological stage improves bacterial growth,
Bio-Falls Quad-Filtration system provides efficient filtration with anaerobic bacteria, Internal sponge optimizes colonization of beneficial anaerobic bacteria, Activated carbon cartridge removes harmful chemicals
Power filter, Self priming, Easy to maintain, Adjustable flow control
What could be better?
Nothing much!
Can be a bit noisy
Might be too small for 20 gallon tank
Prime
Top Choice
Fluval C3 Power Filter, Fish Tank Filter...
Best aquarium filter for 20 gallon tank
What's good?
5-stage clip-on power filter, Two mechanical stages trap large and fine debris, Chemical stage removes toxins, Biological stage improves bacterial growth,
What could be better?
Nothing much!
Prime
Second Choice
Penn-Plax Cascade Hang-on Aquarium...
Best aquarium filter for 20 gallon tank
What's good?
Bio-Falls Quad-Filtration system provides efficient filtration with anaerobic bacteria, Internal sponge optimizes colonization of beneficial anaerobic bacteria, Activated carbon cartridge removes harmful chemicals
What could be better?
Can be a bit noisy
Prime
Best Value
Marina S20 Power Filter
Best aquarium filter for 20 gallon tank
What's good?
Power filter, Self priming, Easy to maintain, Adjustable flow control
What could be better?
Might be too small for 20 gallon tank
Prime

Last update on 2021-07-28 / Affiliate links / Images from Amazon Product Advertising API

Aquarium filters remove harmful chemicals, excess food, organic decay, and fish waste products by fish tank filters. While swimming around, fish continually excrete waste. If you do not remove the debris at an adequate interval, the tank’s toxins will increase to high levels and pollute the fish.

 

Best aquarium filter for 20 gallon tank

 

Aquarium filters clean the fish tank with chemical/biological/mechanical means (or filter media), and they correspond to chemical/biological/mechanical filtration, respectively.

Each of them has its own mechanism, but they continuously help each other. The best filtration device will provide an optimal atmosphere in which all these filtration methods work together to purify water in the aquarium.

This article will cover the best aquarium filter for a 20 gallon tank.

Our top choice – Fluval Power Filter for 30-Gallon Aquariums

The is our top choice for the best aquarium filter for a 20-gallon tank because for the following reasons:

  • It has five stages of filtration.
  • It has a patented filtration system.
  • It has increased the number of dwell times.
  • It is easy to maintain

Best Aquarium Filter for 20 Gallon Tank

#1 Penn-Plax Cascade Hang-on Aquarium Filter 1886/39

Penn-Plax Cascade Hang-on Aquarium Filter

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An innovative Bio-Fall Quad Filtration Device features in the Penn Plax Cascade Hang On Aquarium Filter to keep your tank clean and dry. The poly fiber floss cartridge removes floating particulate matter, whereas the activated carbon cartridge prevents the filter from toxic contaminants, pollutants, odors, and discoloration.

Features and Benefits

  • Noise Free: This filter quietly delivers 100 gallons per hour of crystal clear water for the fresh and marine aquariums of 10-20 gallons.
  • Bio-Falls Quad-Filtration: Innovative Bio-Falls Quad-Filtration Device offers an effective filtration for additional ammonia and nitrite elimination with anaerobic bacteria. It provides optimum oxygenation. 
  • Carbon Cartridge: The enabled Carbon cartridge removes toxic pollutants, pollutants, odor, color, and other contaminants from your aquarium.
  • Internal Sponge: The inner sponge enhances colonization of the beneficial anaerobic bacteria—the poly fiber floss cartridge of the filter traps floating particulate matter.
  • Adjustable Flow Knob: The Adjustable Flow Knob lets you limit the filtration during the feeding time as required. You can use this filter for both fresh and saltwater.

Penn-Plax Cascade Hang-on Aquarium Filter

Why should you buy it?

This filter has an innovative Bio Falls Quad Filtration system that offers efficient filtration for additional ammonia and nitrite elimination. It also offers a noise-free filtration of the aquarium.                                           

Sale
Penn-Plax Cascade Hang-on Aquarium...
  • Hang on aquarium filter quietly delivers 100 gallons per hour of crystal clear water for your fresh or marine aquariums from 10 to 20 gallons in size.
  • Revolutionary Bio-Falls Quad-Filtration system provides efficient filtration with anaerobic bacteria for additional ammonia and nitrite removal providing maximum oxygenation.
  • Activated carbon cartridge removes harmful chemicals, toxins, odors, discoloration, and other contaminants for your aquarium.
  • Internal sponge optimizes colonization of beneficial anaerobic bacteria and polyfiber floss cartridge traps floating particulate matter.
  • Adjustable flow knob allows you to reduce filtration during feeding times or as needed. Aquarium filter is recommended for both freshwater and saltwater applications.

Last update on 2021-07-28 / Affiliate links / Images from Amazon Product Advertising API

 

You might like to read: Best Aquarium Filter For 125 Gallon Tank

 

#2 Marina Power Filter 

Marina Power Filter

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The S20 Marine Power filter has a unique design, which makes it compact and slim. Therefore it reduced the space behind your aquarium. The filter includes adjustable flow control, and with its help, the user can easily control the tank’s water flow level. 

Features and Benefits

  • Compact Design: The Marine Power filter has a compact and slim design that needs less storage than standard filters, and it gives your aquarium an elegant display. 
  • Silent: The filter has an adjustable flow control to control the water flow level in your tank. Its motor is immersed in the water and works very silently.
  • Easy Set-Up: The installation and set up of this filter is effortless. No priming is required, and you can simply plug in and watch it work. The maintenance is quick and straightforward as well.
  • Two Cartridges: The filter has two cartridges: 1 Bio Carb and 2 Bio Clear. Both of them have Ceramitek, a highly porous ceramic filter medium that enhances biological filtration for a stronger aquarium.

Marina Power Filter

Why should you buy it?

The Marine Control Filter has a lightweight and slender layout and needs less storage than standard filters, and it is working silently.                                           

Marina S20 Power Filter
  • Power filter for aquariums up to 20 gallons
  • Self priming
  • Easy to maintain
  • Adjustable flow control

Last update on 2021-07-28 / Affiliate links / Images from Amazon Product Advertising API

#3 Fluval Power Filter 

Fluval Power Filter

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Filters from Fluval have superb filtration for aquariums of any size. This filter is suitable for fresh as well as saltwater tanks. Water is extracted through many stages in this filter. It conducts special 5 stage filtration to ensure that bacteria and impurities are disposed of.

Features and Benefits

  • 5 stage filtration: The Fluval C Power Filter is designed to produce outstanding water quality. It offers comprehensive 5-stage filtering for an excellent performance.
  • Increase Dwell Times: In all stages of the filtration process, the power filter has been configured to provide a maximal area and optimum dwelling times.
  • Patented Refiltration System: The proprietary re-filtration method of Fluvals regulates the flow rate without impacting filtration effectively. When the flow rate is decreased, the filter chamber re-processes up to 50% of the water several times.
  • Maintenance: The impeller cover assembly should be washed once a year for optimum efficiency. Moreover, Every three months, the motor of the filter should be thoroughly cleaned. Make sure to unplug the Fluval C Power Filter before washing, and make sure to remove the cover, filter media, and discard the water left in the filter case.

Fluval Power Filter

Why should you buy it?

The Fluval C Power Filter provides excellent water quality with a complete 5-step filtration system that delivers outstanding performance. The power filter has been designed for optimum residence periods in all these phases of the filtration process.

Sale
Fluval C3 Power Filter, Fish Tank Filter...
  • 5-stage clip-on power filter designed for freshwater and saltwater aquariums between 20 and 50 gallons
  • Two mechanical stages trap large and fine debris, foams easily slide out for quick cleaning
  • Chemical stage with activated carbon effectively removes toxins
  • Biological stage features Bio-Screen pad, blocks debris and provides massive surface area for beneficial bacteria growth
  • Biological Trickle Chamber super charged for fast and efficient nitrification when loaded with Fluval C-Nodes

Last update on 2021-07-28 / Affiliate links / Images from Amazon Product Advertising API

 

You might like to read: Best Aquarium Filter For 75 Gallon Tank

 

#4 Polar Aurora Free Media External Aquarium Filter 

Polar Aurora Free Media External Aquarium Filter

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The Polar Aurora Filter has an enhanced aquarium filtration with a large capacity, 3 stage canister filters. It has innovative canister filters with greater media storage capacity, so the water from the aquarium comes into contact with more filter media during the initial pass.

Features and Benefits

  • Media Trays: It has three media trays that can handle your choice of filter media. It comes with an adjustable spray bar, a useful function for changing the filter output flow.
  • Self Priming: It has an efficient Self-priming Pump, which reduces manual siphoning requirements. It has a single valve and thus eases routine maintenance.
  • Additional filtration: The three versatile media trays will incorporate additional filtration media like Sunsun’s activated carbons and ceramic rings to ensure excellent mechanical, chemical, and biological filtration.
  • Ideal for: This filter is ideal for up to 75 gallons of fish tanks and has a flow rate of 264GPH and has the Pump Power of 18W, and the maximum height is 4.6 Feet.

Polar Aurora Free Media External Aquarium Filter

Why should you buy it?

It has three media trays that can accommodate the range of filter media and comes with an adjustable spray bar that can help modify the filter’s flow output.                                         

Polar Aurora Free Media 265GPH / 370GPH...
  • Good for up to 75 gallon fish tanks SunSun parts can be applied Flow rate: 264 GPH (1000L/hr) Pump Power: 18W Hose size: 3/4" Max-H: 4.6 feet
  • 3 media trays capable of handling your choice of filtration media; Comes with an adjustable spray bar. This is a helpful feature if you want to adjust the output flow from the filter. No Light!!!
  • Convenient self-priming pump that eliminates the need for manual siphoning; Single valve disconnect & priming pump ease routine maintenance
  • Canister filters for aquariums use high water pressure, from a properly powered pump, to force water through the dense filter media. A pump can draw water from an under-gravel filter, and run it into a canister for double filtration
  • The three flexible media trays allow you to add other filtration media such as SunSun's activated carbons, ceramic rings or bio-balls to achieve excellent mechanical, chemical, and biological filtration.

Last update on 2021-07-28 / Affiliate links / Images from Amazon Product Advertising API

#5 GRECH Sterilizer Hang-On Back Filter

GRECH Sterilizer Hang-On Back Filter

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The Grech CBG series Hang-On Back UV Filter with a new and unusual style. While it is ideal for freshwater, it has a “Hang-On Back” style that makes it simple for everyday use. The filter is well-engineered to allow fast installation and silent operation.

Features and Benefits

  • Simple and quick installation: The filter has been wonderfully built for quick installation and quiet use.
  • Daily Use: This filter is suitable for both freshwater and saltwater, and it has a Hang on Back style, which makes it comfortable for everyday use.
  • Filtration: The CBG series filter supports Biological and Mechanical filtration and enables you to control the water flow as per the aquarium needs. It comes with active carbon and bio media.
  • 5W UV Sterilizer: This filter has a 5W UV Sterilizer that you can turn on and off. It helps eliminate algae, keep the aquarium water clear, and enhance aquatic animals’ health from floating parasites.

GRECH Sterilizer Hang-On Back Filter

Why should you buy it?

This filter has a 5W UV Sterilizer that helps remove algae and clean the aquarium water and aids in water animals’ health from floating parasites.

GRECH CBG-800 5W UV Sterilizer Hang-On...
  • Adjustable 211gph Filter Flow Rate with Surface Skimmer to eliminate undesired surface films
  • Features a 5W UV Sterilizer. Helps eliminate algae and bacteria, keeping aquarium water crystal clear
  • Suitable Aquarium Tank Size: 20 to 50 Gallons
  • Dimension: 9 x 5 x 7in (229 x 127.5 x 179mm)
  • Biological and mechanical filtration. Box includes active carbon and bio media

Last update on 2021-07-28 / Affiliate links / Images from Amazon Product Advertising API

 

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Buyer’s Guide: Best aquarium filter for 20-gallon tank

Biological Filtration

The most important filtration is Biological Filtration. It uses healthy bacteria or aquatic plants to utilize the poisonous ammonia and the nitrogen compounds arising from your fish’s waste. The biological filtration method, also called the nitrogen cycle, involves filtering the movement of hazardous wastes. Biological filters must be periodically reviewed. It ensures that the biofilters are blocked and efficiencies reduced. Therefore, always make sure that your aquarium must have proper biological filtration.

 

Best aquarium filter for 20 gallon tank

Chemical and Mechanical Filtration

Next up is Chemical filtration, which uses activated carbohydrates or special resins to extract narcotics, tannins, and other water impurities. As soon as the chemical filtration is saturated with contaminants, toxins will no longer be absorbed by the media. Finally, mechanical filtration uses sponges, filter socks, and filter flow pads that physically exert waste from the water, much like a coffee filter. Mechanical filtration works as compost and collects debris, ensuring that you still clean the filters as a fish owner. 

Therefore, you need to ensure that the filter you are selecting must have proper Mechanical and Chemical Filtration. 

Noise Free Filter

It is more likely that noise from power filters and water pumps may be a splashing sound, which the majority of people don’t like. Therefore, while choosing your aquarium filter, make sure that it produces less and less sound.

Large Capacity Media Baskets

Extra-large media baskets allow aquariums to meet their specifications for media. The pad is free for particle treatment. This is yet another choice that customers must take in compliance with their needs.

Price

Whenever you buy a product, it’s always necessary to check if the product features do justice to the price. The same goes for the filters. Don’t buy an overpriced filter thinking it will be guaranteed a great deal or buy a product just because it is cheap.

 

You might like to read: Best Aquarium Filter for 10 Gallon Tank

Frequently asked questions: Best aquarium filter for 20 gallon tank

How much gravel do you need for a 20-gallon tank?

In general, add around 1 pound per gallon of water to the substrate. That means a good bet of 5 pounds of gravel will be for a 5-gallon fish tank. Likewise, 20 pounds of gravel will be adequate in a 20-gallon fish tank. 

 

Can you put a 20-gallon filter in a 10-gallon tank?

You shouldn’t have a lot of trouble with a 20-gallon filter. There are many users who are using 80-100 gallon tank filters in 30-gallon containers with no issues. Therefore you won’t find many difficulties in putting a 20-gallon filter in a 10-gallon tank.

Conclusion

In our opinion, the Fluval C3 Power Filter, Fish Tank Filter...   is the best choice among the various options that we have considered because the Fluval C Power Filter is designed to produce outstanding water quality and offers comprehensive 5-stage filtering for excellent performance

 

Best aquarium filter for 20 gallon tank

 

The Penn-Plax Cascade Hang-on Aquarium...   is our next best choice because it provides effective filtration for additional ammonia and nitrite elimination with anaerobic bacteria that provides optimum oxygenation

If you are looking for a value for money option, you can also consider the Marina S20 Power Filter , which offers great value and features at a very reasonable price point. 

 

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