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

We looked at all of the review sites and found the best of the best using our data-backed approach.

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

Bestseller No. 1
Tetra Aquatic Turtle Deluxe Kit 20 Gallons, aquarium With Filter And Heating Lamps, 30 IN (NV33230)
  • COMPLETE aquarium KIT: 20-gallon tank is ideal for aquatic turtles, and this kit includes all the essentials needed for success, including a decorative filter with cartridges, basking platform, heating lamp, boxwood plant mat and screen top.
  • INCLUDES WATER FILTER: Decorative ReptoFilter instantly creates a beautiful waterfall while keeping water clean with 3-stage filtration.
  • HEATING: Dome lamps are incorporated into the screen top for warmth and prime basking.
  • CONVENIENT: Includes Tetra food and water care product samples – everything you need to get started.
  • DIMENSIONS: aquarium measures 30 inches wide x 12 inches deep x 12 inches tall.
SaleBestseller No. 2
AquaClear, Fish Tank Filter, 5 to 20 Gallons, 110v, A595
3,692 Reviews
AquaClear, Fish Tank Filter, 5 to 20 Gallons, 110v, A595
  • Aquarium filtration system that offers superior contact time with filter media and energy efficient pump lowers operating costs
  • Quick and easy installation, we recommend that you clean aquarium filter every 2 weeks for maximum operation and efficiency
  • Provides optimal mechanical, chemical, and biological filtrations
  • 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
Bestseller No. 3
MarineLand Penguin 100 Power Filter, 100 GPH (PF0100B),Black
399 Reviews
MarineLand Penguin 100 Power Filter, 100 GPH (PF0100B),Black
  • 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.
Bestseller No. 4
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).
SaleBestseller No. 5
Penn-Plax Cascade Hang-on Aquarium Filter with Quad Filtration System Cleans Up to 20 Gallon Tank,...
745 Reviews
Penn-Plax Cascade Hang-on Aquarium Filter with Quad Filtration System Cleans Up to 20 Gallon Tank,...
  • 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.
Bestseller No. 6
GloFish 20 Gallon Aquarium Kit with LED Lights, Decor Heater and Filter
  • INCLUDES ALL THE ESSENTIALS FOR SUCCESS: This GloFish aquarium kit includes a 20 gallon glass aquarium, LED hood, Tetra mini UL heater, Tetra Whisper 20 filter, GloFish 13" LED light stick, 1 GloFish yellow anemone, 2 plant multipacks, fish food and water conditioner sample as well as a set-up guide.
  • BLUE LED LIGHTING TRANSFORMS YOUR AQUARIUM: The blue LED light completely transforms your aquarium. GloFish and GloFish d?cor fluoresce, creating a colorful, neon display.
  • COMPLETE THE LOOK WITH COLORFUL ADDITIONS: Complete the look by adding pops of color among any gravel you choose with the varying plant sizes and colors included.
  • DIMENSIONS: The 20 Gallon Aquarium dimensions are 24.2" L x 12.5" W x 16.2" H
Bestseller No. 7
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