Sponge filters provide both mechanical and biological filtration. Simply install an airline into the unit and provide both aeration and filtration for your fish. Aerobic bacteria colonize the sponge providing a bacterial substance to facilitate the nitrogen cycle. In addition, the sponge traps larger waste particles mechanically cleaning the water without trapping baby fish.
Product Dimension: 4.5"D X 8.0"H
Max. Tank Size: 20 GAL
Aquarium Bio Sponge Filter (LARGE)