AQUANEAT Aquarium Sponge Filter Breeding Fry Betta Shrimp Nano Fish Tank 4pcs (M Large up to 50Gal)Brand: AQUANEAT Features: Sponge filter provide 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 Recommend tank size: up to 50 gallon, excellent for small size fish like dwarf cichlid, guppy, killifish etc., or for hatcheries, maternity