Multi-function bioogical filtration system. -Patented design and appearence. -Use enviromental friendly and biodegradable filtration sponge. -Can be used with different filtration material to enhance water quality. -Ceramic pearls filtration media will help to remove harmful substance which will increase oxygen level in the tank. -Filtration is suitable for Discus, Crystal shrimp, Planted tanks and all small size tropical fishes.