Bestcool Internal Aquarium Filter, Sponge Filter Moving Bed Media Filter Fluidised Bed Filter for Fish Tanks

?Multi-filtration functions?Imitating the riverbed in nature, the sandstone rolls with the flow of water on the riverbed, and the nitrifying bacteria breed in one generation and one generation, which plays a role in purifying the water. ?V-1 filter media? various microorganisms and nitrifying bacteria can be attached to the surface. through continuous tumbling, the filter media collide with each other to let the dead bacteria fall off, and the new bacteria adhere to it, which plays a role in self-repair and regeneration of the filter material. No need to replace the filter material during usage period ?Fits fish tank size: 20 to 40 gallon?Easy to set up: simply install an airline tube into the unit and turn on the air pump,comes with 4 suction cups,can be easily installed anywhere of the aquarium; suitable for shrimp tank, betta tank, breeding tank, fry tank, goldfish, discus, guppies, baby fish or other fish. ?Easy to use? Using an air hose, connect one end to you air pump and the other end to this filter. The water flow exit tube on the sponge filter is adjustable so you can change direction and height of the water flow ?Removable Fine Sponges ?you can easy to take down the 2 sponges from the filter to clean or replace it, the 2 sponges are fine 60ppi not coarse, which means more surface area for beneficial bacteri to live on. Don't use tap water to clean it, just rinse or squeeze the sponges by using the aquarium water