Aquapapa Air Driven Bio Corner Filter Sponge Fry Shrimp (Nano Fish Tank Aquarium 40 Gal) This filter is excellent for small size fish like dwarf cichlid, guppy, killifish, shrimp etc., or for hatcheries, maternity, nano tanks, and fry tanks, as the filter produces minimal current and has almost no way to suck the fish through the filter. Also, the air infusion chamber produces minute bubbles which increase the oxygen solubility. Simply install an airline into the unit and provide both aeration and physical filtration combining with biochemical filtration for your fish. They are especially useful for breeding small fishes. Reduces noise from air pump and consumes lowest wattage Multi-layers easy to clean and operate, For tank size up to 40 Gallon Dimension: 2.75"(L) x 3.15"(W) x 7.0"(H)