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
- 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),...
- 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
- 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
- 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.