The mini filter aquarium is small in size and suitable for small aquariums such as spherical aquariums, special-shaped aquariums and other small home aquariums. It can filter and supply oxygen effectively. Mini filter: It is small and suitable for small aquariums such as spherical aquariums, special-shaped aquariums and other small home aquariums. It has three major functions: filtration, water circulation and oxygen supply. Filtration function: Small in size and large in function, this mini filter can filter effectively. How to use: Works completely immersed in water. Suction cup design: Strong suction, can be installed anywhere in the aquarium. Do not use an overly large air pump to avoid uneven mixing of water and air. Easy to clean and maintain; low loss, high efficiency; super quiet; long service life. Easy to maintain: Clean the sponge once a month and replace it every 5 to 6 months.