Fluval FX4/FX5/FX6 Bio-Foam, Replacement Aquarium Filter Media, 2-Pack, A239 FIREOR When a colossal threat is

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Fluval FX4/FX5/FX6 Bio-Foam, Replacement Aquarium Filter Media, 2-Pack, A239 FIREOR When a colossal threat isFeatures: Replacement Filtration: Bio Foam filter inserts are designed for use in Fluval FX4, FX5 and FX6 Canister Filters in freshwater and saltwater aquariums. Double Duty: These Bio Foam filters perform as both mechanical and biological filters. Intricate Design: Bio Foams dense structure is ideal for trapping small particles, with an intricate, porous network that provides vast surface area to facilitate biological activity. Maintain Clean