Increase Water Oxygen Content: The aquarium air filter filters out excess impurities in the water for aquarium organisms, helps stabilize water quality, and increases oxygen solubility. Easy to Use: There is a suction cup at the bottom of the aquarium filter, which can be attached anywhere in the aquarium. There is no need to specially reinforce the base, and there is no need to worry about accidentally harming the fish. Ultra-Quiet: When the aquarium air pump is used, it runs quietly and produces no noise, but the filtration 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 out impurities in the water, and the middle layer is a layer of bubble stone, which can increase the oxygen content in the water and increase the survival rate of fish. The top layer is the water outlet. Wide Range of Applications: The oxygen filter is suitable for small aquariums such as spherical aquariums, small aquariums, oddly shaped aquariums, and other small household aquariums.