model:(XY-2836) Perfect for use: sponge filters provide biological filtration, air powered, work great with no noise and longer life Benefit: increase the amount of dissolved air in the feed water. The sponge can be used multiple times. Instead of tap water, use the tank water to clean it when changing water Function: The sponge retains the larger particles of waste by mechanically cleaning the water without trapping baby fish. They are useful as a breeding filter or as a secondary filter. Or they can be used as a pre-filtration unit by attaching to an external filter or higher. Note: Rinse the sponge under cold or lukewarm running water once a week. Do NOT use hot or very cold water Widely Used: This aquarium filter is small in size and easy to hide behind the plant. It fits in every corner and is ideal for shrimp aquariums, breeding tanks, betta aquariums, nano aquariums, turtle aquariums, aquariums, goldfish, baby fish or other fish