Aquapapa 4X Dual Bio Sponge Filter For Betta Fry Aquarium Fish Tank Up To 30 Gallon Ea. (Dual Sponge Filters 4-Pack)

This bio sponge filter provides mechanical and biological filtration for your tank. Driven by air it creates numerous minute bubbles which promotes gas exchange process and increases oxygen dissolved level traps small particles and removes harmful waste from water.