With a super airlift system， the corner filter has excellent effect on oxygenating in the water and working silently physical filtration combining with biochemical filtration. Simply install an airline into the corner filter and provide both aeration and physical filtration combining with biochemical filtration for your fish. This corner filter is especially useful for breeding small fish.Feature:Supply the water with much needed oxygenReduce noise from air pump and consume lowest wattageMulti-layer media， easy to move and cleanTop layer of white filter pad provides a mechanical filtrationBlack bio-sponge and ceramic rings with gravel provide biochemical filtrationSupport the colonization of bacteria， which will break down harmful wasteDimensions: Approx. 4 (L) x 3 (W) x 4.7 (H) inchMaterial: Plastic housing， sponge， gravel and ceramic filterPackage Includes:1x Corner Filter