【Multiple filtration functions】 The sponge filter has two filter sponges, means more surface to plant beneficial nitrifying bacteria and faster circulation. 【greatly increases the oxygen】 connected to the air pump, it can produce a large number of bubbles and improve the oxygen level in the water, making the double effect of oxygenation and biofiltration and Keeping clean water. 【Low noise level】 The sponge filter produces very little sound and does not increase it due to long-term use. It is suitable for domestic use and will not affect rest and recreation with family. 【Easy to install】 The filter includes two cups that can be mounted anywhere and can be easily hidden on The rear wall of the aquarium. It is also convenient to remove and clean from time to time without damaging the aquarium and the filter. You can choose according to your own needs. Perfect for shrimp tank, betta tank, brood tank, turtle tank, red fish, discus, crayfish, fry, baby fish or other fish. why Do you need a