product description:
\ This product is developed for pocket fish tank. It uses environmentally friendly sponge as filter material and built-in bubble stone, which is combined with air pump to increase oxygen and filter water quality more effectively.
\ With air pump as the power source, the gas lift power is high, no noise, improve the dissolved gas in water, combine the principles of mechanical filtration and biological filtration, and use multi-level filtration to cultivate high-density digestive flora to achieve clean and good water quality stability, it is suitable for breeding, breeding and juvenile fish, especially for Symphysodon aequifasciatus, small fish and fry.

Note: it needs to be used with an oxygen pump.