XINYOU XY-380 Aquarium Fish Tank Biochemical Sponge Filter， 4-1/2-Inch</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>High-quality aquarium sponge filter for efficient biological filtration</li><li>Supports large bacterial populations to break down aquarium waste</li><li>Dense， high-quality foam ensure reliable longer lasting aquarium use</li><li>Do not trap fish fry and are safe for small size fish like dwarf cichlid， guppy， killifish， etc.</li><li>Sponge Filter Dimensions: 4.5"D x 8.0"H - Max tank size: 20 Gal.</li></ul></div></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br><img src='http://ecx.images-amazon.com/images/I/41jqPe%2Bp7WL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/41Xvlzw8jlL.jpg' noproxy></br>