Suitable for aquariums under 60 cm. Comes with 2 suction cups to stick to glass, can be installed anywhere, also can be used as a pre or post filter; Perfect for shrimp tank, betta tank, hatchery tank, turtle tank, goldfish, discus, crab, juvenile fish or other fish. Multiple filtration functionThe sponge filter has two small filter boxes, which means more surface area for seeding beneficial nitrifying bacteria and faster circulation, the filter effect is better. Sponge filters provide both mechanical and biological filtration, providing the ideal spot for bacteria to settle, and sponges capture larger debris particles that mechanically clean the water without trapping baby fish. Keep Clean Water QualityYou can use 2 sponges easily remove the filter to clean or replace it. It also has a filter holder inside that helps remove harmful substances and provides additional cleaning options. Circulate faster to keep your aquarium water extra clean and clear. Make your fish happy and the