Aquatop Sponge FilterAquatop Classic Flow Sponge Filters are an efficient and low maintenance filtration solution for both freshwater and saltwater aquariums. Designed to provide mechanical and biological filtration, these filters promote beneficial bacteria growth while trapping debris, ensuring a clean and healthy tank environment. Ideal for shrimp tanks, fry tanks, or aquariums with small, delicate fish, sponge filters create gentle water flow to prevent stress or harm