Best 20 Gallon Fish Tank Filter In February 2023

In this article, we will explore the 20 gallon fish tank filter that is now on the market. In addition to that, we have provided you with a detailed guide that will assist you in choosing the right product. We really hope that by looking through the reviews of the top best 20 gallon fish tank filter products that we've provided below, you'll be able to quickly narrow your choices and select the one that satisfies your needs the best.

We have spent more than 116 hours testing a lot of 20 gallon fish tank filter. According to our research, we think Aqueon 20 Gallon Fish Tank Filter is the best overall. For more of our top picks, read on! Also, check out our buying guide for some suggestions on how to choose the right cat toy.

Editor's Choice
Aqueon QuietFlow 20 LED PRO Aquarium Fish Tank Power Filter For Up To 30 Gallon Aquariums
9.7
Aqueon QuietFlow 20 LED PRO Aquarium Fish Tank Power Filter For Up To 30 Gallon Aquariums
Premium Pick
Tetra Whisper IQ Power Filter 20 Gallons, 130 GPH
9.4
Tetra Whisper IQ Power Filter 20 Gallons, 130 GPH
Budget Pick
Penn-Plax Cascade 400 Fully Submersible Internal Filter
9.1
Penn-Plax Cascade 400 Fully Submersible Internal Filter

Top 10 Best 20 Gallon Fish Tank Filter Reviews 2023

1. Aqueon QuietFlow 20 LED PRO Aquarium Fish Tank Power Filter For Up To 30 Gallon Aquariums

  • Patented bio-holster removes toxic ammonia and nitrites
  • Diffuser grid removes additional toxins while adding oxygen for more active fish
  • Reduces splashing making the return exceptionally quiet
  • Dense floss removes particles and debris
  • Activated carbon removes toxins, odors and discoloration

2. Tetra Whisper IQ Power Filter 20 Gallons, 130 GPH

  • CAPACITY: The Tetra Whisper IQ 20 Power Filter works in filters up to 20 gallons (130 GPH).
  • QUIET AQUARIUM FILTER: The Tetra Whisper IQ Power Filter with Stay Clean technology contains a sound shield for quiet filtration less than 40 dB.
  • SELF PRIMING: Submerged motor starts up with no priming required.
  • CARTRIDGE REFILLS: Change cartridges monthly; uses large-sized Tetra Whisper Bio-Bag Filter Cartridges (refills sold separately).
  • STAY CLEAN TECHNOLOGY: By maintaining healthy pH levels, creates easier maintenance for healthier fish.

3. Penn-Plax Cascade 400 Fully Submersible Internal Filter

  • QUIET & EFFICIENT: The Cascade 400 Submersible Filter quietly delivers crystal clear water throughout the aquarium. This filter cycles water at 110 Gallons per Hour (GPH) for tanks up to 20 Gallons in size. It's great for Freshwater and Saltwater aquariums, along with a variety of Terrarium setups.
  • ACCOMMODATING: The adjustable flow switch allows for increased or decreased water flow at will, which is extremely helpful during feeding times, or use it as needed. The directional flow nozzles allow for additional tank customization and convenience. Furthermore, the filter utilizes 4 suction cups, allowing for both vertical and horizontal mounting positions.
  • VENTURI AERATION: The Cascade 400 features Venturi Aeration, which provides your tank with filtered, oxygenated water. This feature eliminates the need for an air pump. Instead of two separate units, this filter combines both functions: simply connect the Air Tube and Air Muffler to the Flow Nozzle, and follow the included instructions. Please fully submerge and fill filter with water before turning on.
  • FULLY SUBMERSIBLE: The Cascade 400 utilizes 2 filter media chambers, and comes with filter media: 1 refillable Carbon Cartridge and 1 Bio-Sponge. In addition to optimizing the colonization of anaerobic bacteria, this filter traps floating particulate matter, removes harmful chemicals and toxins, clears up discolorations, and reduces foul odors from your aquarium's water.
  • AERATING SPRAY BAR: In addition to the two Flow Nozzles and the Venturi Aeration, the Cascade 400 includes a Spray Bar that evenly distributes filtered water over the surface of your aquarium.

4. Tetra Whisper In-Tank Filter 40i with BioScrubber - 20-40 gallon

  • CATCHES DEBRIS: Dense, dual-sided mesh filters debris and fish waste.
  • INTERNAL FILTER: Mounts on the inside of your aquarium with clip (included).
  • CONVENIENT DESIGN: Uses large easy to change Bio-Bag cartridges; filter mounts inside aquarium, making it possible to place tank flush against the wall.
  • UNIVERSAL DESIGN: Tetra Whisper 40i Internal Filter is an all-in-one air pump and water filter system.
  • AERATES WATER: Air-driven design filters up to 170 GPH while oxygenating water.

5. Marineland Penguin Bio-Wheel Power Filter 100 GPH

  • REPLACEMENT FILTER CARTRIDGE: Pack of 3 cartridges fits Marineland Penguin PRO Power Filters 100, 125 and 175; also fits the original Penguin Power Filter 150.
  • COLOR-CODED PACKAGING: Rite-Size packaging makes it simple to choose the right size replacement cartridge for your filter.
  • OPTIMUM WATER-TO-CARBON CONTACT: Ribbed backing ensures even distribution of carbon for sparkling clean water.
  • THREE-STAGE FILTRATION: Mechanically filters water through a pad of double-thick poly fiber. Chemically filtered through Black Diamond Premium Activated Carbon. BIO-Wheel technology delivers wet/dry filtration.
  • EASY TO INSTALL: Pre-assembled cartridges slide easily into place, providing mechanical and chemical filtration and making replacement fast, dry and effortless.

6. PULACO Aquarium Internal Filter 3 to 20 Gallons

  • [Quiet & Efficient] :The filter designed with 5watts 132GPH water pump, low power comsuption, low noise, stable flow, suitable for both seawater and fresh water.
  • [Features] :Quick and easy installation, Waterfall design to help water aeration, large size filter plate, blocking water debris, removes impurities, overall filtration idea. Minimum Water Line :1.9 inch (Low water line is suitable for amphibian)
  • [Application] :Perfect Aquarium filter for aquatic turtle tanks, Reptiles, Amphibians, Frog, Cichlids, Newt or Fish tank in any aquarium up to 20 gallons.
  • [Satisfaction guaranteed] Our Aquarium Filter is built with durability and safety, based on thoughtful design. In the remote possibility that you're not satisfied with our product, just contact us, and we will gladly give you a new Aquarium Filter replacement. Lifetime warranty and 24 Hours Professional After-sales Service.
  • [Note] : Before you install this filter, please read this instruction carefully and keep it for future reference. we suggest you to clean the aquarium filter in every 2 weeks to keep standard filtration efficiency.

7. Tetra Whisper EX 30 Filter

  • SIZE This filter fits 20 to 30 gallon aquariums
  • Age Range Description: All Ranges
  • NO-MESS FILTER CARTRIDGE CHANGES Design minimizes dripping to make cartridge changes easy
  • WHISPER QUIET The Tetra Whisper EX Power Filter provides silent multi-stage filtration for clear clean water
  • CONTINUOUS FLOW Moves water continuously to prevent debris buildup
  • FAST SETUP Sets up easily right out of the box – no priming required

8. AquaClear 50 Power Filter, Fish Tank Filter for 20- to 50-Gallon Aquariums

  • Quick and easy installation; we recommend that you clean aquarium filter every 2 weeks for maximum operation and efficiency
  • Aquarium filtration system that offers superior contact time with filter media and energy efficient pump lowers operating costs
  • Comes equipped with AquaClear Foam; Activated Carbon Filter and BioMax and Cycle Guard for superior water quality
  • Filtration volume is up to 7 times larger than comparable fish tank filters
  • Provides optimal mechanical; chemical; and biological filtration

9. NICREW Aquarium Internal Filter, Submersible Power Filter

  • Quickly assembles and disassembles, comes with four suction cups for secure in-tank installation, suitable for both freshwater and saltwater tanks
  • Provides effective and thorough biological and chemical filtration, creating superior aquarium water environment
  • Enable to generate abundant air bubbles and water flow, optimal for oxygen supplement and water circulation of aquarium
  • Activated carbon and fine filter foam trap debris and fish waste, absorb odors
  • Equipped with adjustable air regulator that distributes a gentle flow of water, making it safe for delicate fish or shrimp

10. Aqua-Tech Ultra Quiet Power Filter

  • Age range description: All Life Stages
  • Quiet: decoupled motor with dampeners reduces noise to below 40 db.
  • Powerful: impeller and motor assembly designed for efficient power usage filters 10- to 20-gallon aquariums 5 times per hour.
  • Sleek design: designed to fit standard aquarium hoods and canopies, the aqua-tech ultra quiet power filter makes aquatic filtration easy.
  • Assembled Product Dimensions: 4.00" L x 8.00" W x 7.50" H
  • Includes cartridge: the molded ribbed back maximizes contact with water – includes premium activated carbon.
  • Biological filtration: bio-foam biological filtration removes toxic ammonia and nitrites on contact.