Hang On Back Filters

The alternatives

Other contenders

• Fluval AC20

  Choose Fluval AC20 for a 5 to 20 gallon freshwater or saltwater tank when adjustable flow matters; fill its body before startup.³⁴

• Fluval AC30

  Choose Fluval AC30 for a 10 to 30 gallon freshwater or saltwater tank when adjustable flow matters; fill its body before startup.³⁴

• Fluval AC50

  Choose Fluval AC50 for a tank above 35 gallons and up to 50 gallons when you need a larger rated fit; its full range is 20 to 50 gallons.⁴

• Fluval AC70

  Choose Fluval AC70 for a tank above 50 gallons and up to 70 gallons; its full stated range is 40 to 70 gallons.⁴

• Fluval AC110

  Choose Fluval AC110 for a tank above 70 gallons and up to 110 gallons; its full stated range is 60 to 110 gallons.⁴

Buying advice

• Check the stated tank range, supply rating and rim fit; the AC20’s published US power figure applies to 120 V, 60 Hz.³⁴

For tanks up to 35 gallons

Choose Tidal within its 35 gallon rating for automatic priming; choose AC20 within 5 to 20 gallons or AC30 within 10 to 30 gallons for verified adjustable flow.¹³⁴

• Seachem Tidal
• Fluval AC20
• Fluval AC30

For adjustable flow

Choose AC20 within 5 to 20 gallons when you want to adjust output; its control changes flow after the filter is primed.³⁴

• Fluval AC20
• Fluval AC30
• Fluval AC50
• Fluval AC70
• Fluval AC110

For saltwater aquariums

Choose AC20 for a 5 to 20 gallon saltwater aquarium when you want adjustable flow and separate media components.³⁴

• Fluval AC20
• Fluval AC30
• Fluval AC50
• Fluval AC70
• Fluval AC110

For a filter that restarts itself after a power cut

Choose the Seachem Tidal for its self priming pump within its stated 35 gallon rating.¹

• Seachem Tidal

For media you rinse and keep

Tidal and AC20 use no disposable cartridges; check which individual media are cleaned and which are replaced.²³

• Seachem Tidal
• Fluval AC20
• Fluval AC30
• Fluval AC50
• Fluval AC70
• Fluval AC110

How they compare

Scroll the table to see every product and specification.