Best 20 Gallon Aquarium Filter – Top 7 Picks and Reviews 2020

We went over the reviews online and found the best of the best using our data-backed approach.

Here’s a look at the best 20 Gallon Aquarium Filter

Bestseller No. 1
Tetra Whisper IQ Power Filter 20 Gallons, 130 GPH, with Stay Clean Technology
158 Reviews
Tetra Whisper IQ Power Filter 20 Gallons, 130 GPH, with Stay Clean Technology
  • 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.
  • STAY CLEAN TECHNOLOGY: By maintaining healthy pH levels, creates easier maintenance for healthier fish.
  • CARTRIDGE REFILLS: Change cartridges monthly; uses large-sized Tetra Whisper Bio-Bag Filter Cartridges (refills sold separately).
Bestseller No. 2
Tetra Whisper EX 30 Filter For 20 To 30 Gallon aquariums, Silent Multi-Stage Filtration (26311),...
1,375 Reviews
Tetra Whisper EX 30 Filter For 20 To 30 Gallon aquariums, Silent Multi-Stage Filtration (26311),...
  • WHISPER QUIET The Tetra Whisper EX Power Filter provides silent multi-stage filtration for clear clean water
  • FAST SETUP Sets up easily right out of the box – no priming required
  • CONTINUOUS FLOW Moves water continuously to prevent debris buildup
  • NO-MESS FILTER CARTRIDGE CHANGES Design minimizes dripping to make cartridge changes easy
  • SIZE This filter fits 20 to 30 gallon aquariums
SaleBestseller No. 3
Aqueon QuietFlow LED PRO Aquarium Power Filter 20
  • Dense floss removes particles and debris
  • Activated carbon removes toxins, odors and discoloration
  • Patented bio-holster removes toxic ammonia and nitrites.Do not rinse holster in tap water and do not use cleansers to clean
  • Diffuser grid removes additional toxins while adding oxygen for more active fish
  • Reduces splashing making the return exceptionally quiet
SaleBestseller No. 4
Tetra Whisper Internal Filter 10 To 30 Gallons, For aquariums, In-Tank Filtration With Air Pump
2,247 Reviews
Tetra Whisper Internal Filter 10 To 30 Gallons, For aquariums, In-Tank Filtration With Air Pump
  • UNIVERSAL DESIGN Tetra Whisper 20i Internal Filter is an all-in-one air pump and water filter system
  • INTERNAL FILTER Mounts on the inside of your aquarium with clip (included)
  • CATCHES DEBRIS Dense dual-sided mesh filters debris and fish waste
  • AERATES WATER Air-driven design filters up to 125 GPH while oxygenating water
  • CONVENIENT DESIGN Uses large easy to change Bio-Bag cartridges filter mounts inside aquarium making it possible to place tank flush against the wall
Bestseller No. 5
AQUA-TECH Ultra Quiet Power Filter, for Aquariums 10-20 Gallons
  • 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.
  • 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.
Bestseller No. 6
NICREW Aquarium Internal Filter, Submersible Power Filter with Adjustable Waterflow, Aeration System...
  • Provides effective and thorough mechanical and biological filtration, creating superior aquarium water environment
  • Activated carbon and fine filter foam trap debris and fish waste, absorb odors
  • Enable to generate abundant air bubbles and water flow, optimal for oxygen supplement and water circulation of aquarium
  • Equipped with adjustable air regulator that distributes a gentle flow of water, making it safe for delicate fish or shrimp
  • Quickly assembles and disassembles, comes with four suction cups for secure in-tank installation, suitable for both freshwater and saltwater tanks
Bestseller No. 7
Marineland Penguin Bio-Wheel Power Filter 150 GPH, Multi-Stage Aquarium Filtration
399 Reviews
Marineland Penguin Bio-Wheel Power Filter 150 GPH, Multi-Stage Aquarium Filtration
  • WITH ROTATING BIO-WHEEL: Patented Bio-Wheel technology provides excellent wet/dry biological filtration.
  • MULTI-STAGE FILTRATION: Delivers mechanical, chemical and biological aquarium filtration to maintain a clean aquatic environment.
  • COMPATIBILITY: Use with Marineland Rite-Size Filter Cartridges (see individual filter for sizing recommendations).
  • FIVE SIZES: Available in 75 GPH, 100 GPH, 150 GPH, 200 GPH and 350 GPH sizes.