Aquarium Bio Corner Sponge Filter, for Breeding Shrimp Nano Fish Tank, up to 10Gal

New design: quarter-cylinder shape increases the surface area to get a better water and oxygen exchange rate. It also make the filter easy to hide in the corner of a tank Sponge filter provide both mechanical and bio filtration, also, the air infion chamber produces minute bubbles which increase the oxygen solubility Safe for fish: soft sponge material, traps floating debris and won't suck up your fish, excellent for small size fish like betta, dwarf cichlid, guppy, killifish etc., or for hatcheries, maternity tanks, and fry tanks, as the filter produces minimal current and has almost no way to suck the fish through the filter