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Features: Sponge filters provide both mechanical and biological filtration Simply install an airline into the unit and provide both aeration and filtration for your fish Aerobic bacteria colonize the sponge providing a bacterial substance to facilitate the nitrogen cycle The filter is therefore the best choice for specific application for raising Discus, Angel Fish and other fish In addition, the sponge traps larger waste particles mechanically cleaning the water without trapping baby fish They are useful for as breeding filter or as secondary filter Or they can be used as pre-filtration unit by fitting to an external or a top filter Package Includes: 1 x Huijukon Air Pump Double Sponge Filter for Aquarium