【Protect water quality】The oxygen filter can filter biologically, stabilize water quality, add oxygen solubility, increase the oxygen content in the aquarium, and increase the rate of survival. 【Three-layer filtration】 The bottom of the mini aquarium air filter is a layer of biochemical sponge to prevent small fish from being sucked into the filter. The stand is bubble stone and the top is the funnel outlet. It can increase the oxygen levels in the aquarium and increase the survival rate. 【Suction cup design】The air sponge filter comes with a suction cup which is attached to prevent fish from move through the water. It can be installed anywhere on the glass of the aquarium. 【High quality materials】The aquarium sponge filter is made of high quality durable plastic, which is non-toxic and durable. It is harmless to all fish and harmless to the environment. 【Widely Used】The organic sponge filter is suitable for small aquariums such as spherical aquariums, small aquariums, special-shaped
