[Improve water quality] The sponge filter has a large pore area where aerobic bacteria can spread. Cultivating nitrifying bacteria can provide excellent biological filtration for your tank. Bettas, fry and other small fish will never be sucked into the filter. The slow flow of this filter is ideal for breeding and spawning discus, dwarf cichlids, guppies and dead fish. [Fine filtration] As the water passes through the pores, the sponge traps dirt in your tank, making the water crystal clear. It is very effective and breaks down toxic waste in the tank. Easy to clean and reuse: the sponge can be used several times. When changing water, do not use tap water, but use water from the water tank for cleaning. Simply rinse and wring out several times until water runs out of the sponge. Versatility: This aquarium filter is small and can be easily hidden behind plants . Suitable for any corner, ideal for shrimp aquariums, breeding aquariums, betta aquariums, nano aquariums, turtle aquariums, aquariums, goldfish, juveniles or other fish. /p>