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These filters are ideal for breeding / fry tanks, and are very popular among cichlid / discus keepers. Sponge filters provide both mechanical and biological filtration - Simple, effective and easy to clean Helps increase the oxygen solubility, supplying the water with much needed oxygen. Made of food-grade materials which are absolutely safe and the aquarium filter operation is quiet. Can be installed anywhere and can be easily hidden on the back wall of your aquarium.