• 3-in-1 Filter: equipped with aquarium pump and double filter media, it can filter water, add oxygen, and create a fountain at the same time. • Ultra Quiet: the pump is really quiet, which will not disturb your fish (the pump must be completely submerged in water when in use). • Humanized Design: the water inlet adopts a narrow fence to prevent fish and shrimp from entering the filter. • Replacement: it is recommended to replace the carbon pack every 30 days and the foam block every 90 days (sold separately). • Easy to Install: with 5 powerful suction cups, it is easy to place the filter in the aquarium and attach it to the aquarium wall.