Aquapapa New XY-180 Sponge Filter Breeding Fry Betta Shrimp Nano Fish Tank Aquarium 10 Gal Provides both mechanical and biological filtration. Simply install an airline into the unit and provide both aeration and filtration for your fish ( Airline tubing and pump not included, sold separately). 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. Tube Size: 2.1 x 7cm / 0.8" x 2.7" (D*H); Filter Size: 7.5 x 9.2cm / 2.9" X 3.6" (D*H)