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  1. 4Pcs Small Aquarium Bio Sponge Filter with Suction Cups, Check Valves for 5 Gal,

    eBay

  2. Pawfly Mini Aquarium Sponge Filter, Small Fish Tank Internal Filter

    Manufacturer: Pawfly. Manufacturer : Pawfly. Directions: 1. Attach the sponge filter to your aquarium. Clean the sponge every 2-4 weeks with aquarium water only, avoiding tap water. Replace the white sponge every 2-3 months.

    eBay

  3. Pawfly Mini Aquarium Sponge Filter, Small Fish Tank Internal Filter

    Manufacturer: Pawfly. Manufacturer : Pawfly. Directions: 1. Attach the sponge filter to your aquarium. Clean the sponge every 2-4 weeks with aquarium water only, avoiding tap water. Replace the white sponge every 2-3 months.

    eBay

  4. Pawfly Mini Aquarium Sponge Filter, Small Fish Tank Internal Filter

    Manufacturer: Pawfly. Manufacturer : Pawfly. Directions: 1. Attach the sponge filter to your aquarium. Clean the sponge every 2-4 weeks with aquarium water only, avoiding tap water. Replace the white sponge every 2-3 months.

    eBay

  5. Mini Aquarium Filter Air Driven Sponge Filter for Small Fish Tank 0.5-5 Gallon

    EmmaWu Mini Aquarium Filter Air Driven Sponge Fish Tank Filter for Small Tank 0.5-5 Gallon. Air Pump Driven Filter, Great For 0.5-5 Gallon Tank. Very Easy To Clean, Wash the sponge When Dirty. A Filter and An Air Tube included.

    eBay

  6. Carefree Fish Aquarium Small Sponge Filter Air-Operated Quiet for 3~10Gal Fis

    Carefree Fish Aquarium Small Sponge Filter Air-Operated Quiet for 3~10Gal Fish Tank for Saltwater and Freshwater with 3Ft Tubing Biochemical Filtration Balls and Fluidized Beds(Not Include Air Pump). However, the most important function of the sponge is to prevent fish waste and other debris from entering the biochemical filtration chamber, which could affect the nitrifying bacteria system.

    eBay

  7. Aquarium Small Sponge Filter Air-Operated Quiet for 3~10Gal Fish Tank Saltwater

    Size 3~10Gal. Aquarium Small Sponge Filter Air-Operated Quiet for 3~10Gal Fish Tank for Saltwater and Freshwater with 3Ft Tubing Biochemical Filtration Balls and Fluidized Beds(Not Include Air Pump). Fluidized bed: It can convert ammonia and nitrite in water into less toxic nitrate.

    eBay

  8. Powerful Submersible Aquarium Filter with Double Filtration for Large Fish Tanks

    No more frequent tank changes—this multifunctional filter excels in maintaining water clarity while providing essential aeration and circulation. CRYSTAL CLEAR: Reduces the frequency of water changes, providing an all-in-one solution: aquarium air pump, filtration, water pump, and water wave maker.

    eBay

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