XINYOU XY-380 Aquarium Fish Tank Biochemical Sponge Filter 4-1/2-Inch, 6-pack

Biochemical sponge filter provides both mechanical and biological filtration. Simply install an airline into the unit and provide both aeration and filtration for your fish. In addition, the 4 1/2 inch sponge filter traps waste particles mechanical.

High-quality aquarium sponge filter for efficient biological filtration Supports large bio-filtration populations to break down aquarium waste Dense, high-quality foam ensure reliable longer lasting aquarium use Do not trap fish fry and are safe for small size fish like dwarf cichlid, guppy, killifish, etc. Sponge Filter Dimensions: 4.5"D x 8.0"H - Max tank size: 20 Gal.