hygger Aquarium Sponge Filter 55-125 Gallon Fish Tank Filter for Breeding Fry Shrimp Snails Betta Air-Powered Filter with Reusable Biochemical Ball Spare Sponge Foam FilterBrand: hygger Features: Precision Double Filtration: hygger sponge filter consists of a circular bio cotton and a chamber base with bio ceramic ball that provide both mechanical and biological filtration for your aquarium, which is suitable for low flow breeding like betta, guppy, shrimp, snail, fish fry. Or as a pre filter for other filtration systems and also be used as an auxiliary filter for large tanks Working Principle: this air driven sponge