Fluval Bio-Foam+ for FX2/FX4/FX5/FX6 Canister Filter, 2-Pack

Designed specifically for FX2, FX4, FX5 and FX6 high performance canister filters, Bio-Foam performs double duty as both an effective mechanical and biological media.. Features. Mechanical/Biological filter media. Dense structure ideal for trapping small particles. Intricate, porous network provides vast surface area to facilitate growth of beneficial bacteria. Helps create clean and healthy water conditions. For use in freshwater and saltwater aquariums. Convenient 2-pack format. 2x bio-foam pads included