4 Pack Double Bio Sponge Filter, For Fry, Betta, Shrimp, Nano, Aquarium Fish Tank (Large Up To 55 Gal)

Features: Sponge filter provides both mechanical and bio filtration also the air infusion chamber produces minute bubbles which increase the oxygen solubility Easy to set up & clean: simply install an airline into the unit and turn on the air pump simply rinse and squeeze sponge in tank water Excellent for small size fish like betta dwarf cichlid guppy killifish etc or for hatcheries maternity tanks and fry tanks as the filter produces minimal current and has almost no way to suck the fish through the filter Package includes: 4 x Filter