Designed for use with an air pump or powerhead, the Seapora Breeder Sponge Filter provides both mechanical and biological filtration. It is simple to assemble and features a weighted base for stability. The Breeder Sponge Filter is easily maintained (it can be rinsed in aquarium water and reused), and has a hollow center that's great for additives. Safe for use in breeding or fry aquariums. Suitable for smaller aquariums (5-20 Gallons).