Increase Oxygen Content of Water: The aquarium air filter filters out excess impurities in the water for aquarium organisms, helps stabilize water quality and increases the solubility of oxygen. Easy to UseThere is a suction cup at the bottom of the aquarium filter, which can be adsorbed anywhere in the aquarium. There is no need to reinforce especially the base, and there is no need to worry about accidentally hurting the fish. Ultra-Quiet: When the aquarium air pump is used, it works quietly and makes no noise , but the filtering effect is excellent, you can use it with confidence. Three-Layer Design: The bottom of the mini filter pump is a layer of biochemical sponge, which can filter impurities in the water, and the middle layer is layers of bubble stone, which can increase the oxygen content in the water and increase the survival rate of po issons.The upper layer is the water outlet. Wide range of applications: the oxygen filter is suitable for small aquariums such as spherical aquariums, small aquariums, special-shaped aquariums and others small domestic aquariums.