SPNOGE filter made of high -quality ABS plastic, and non -toxic, transparent appearance, skeleton top cover fence design, fish accidentally enter the filter to prevent them from damaging them. Effecting the Biochemical Filter Cotton effectively filtering large residues, the biochemical filter cotton can effectively distinguish the biological filter ball quickly; Multi -layered filtration design can quickly install the nitrification system, eliminate the smell, purify the water quickly and provide a clean and y environment for fish. .Oxygenation: Fish filter is a built -in bubble stone used with the aquarium oxygen pump, can effectively increase the amount of oxygen dissolved in water and provide sufficient oxygen for fish. . NoSESSiz <30db: Filter works with the drive of the air pump, he does not produce sound, you can only hear the sound of the water flow and the sound of the air pump in the study (Note: The air pump is not included) . Light fish tank can be applied: 7.5x 7.5x11cm/2.95x2.95x4.33 is suitable for the use of a 1-20 galliture fish tank, the base of the weighted process will not swim upwards to ensure that the tank filter sinks to the bottom of the fish tank work.