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Serenity Bio Sponge Filter with Filter Media Chamber - Single SMXY-2825 Equipment pro-vitamins and chemically well-defined substancesDescription Biological filtration: The Serenity Medium Sponge Filter SMXY 2825 is a biological filter that uses a sponge and media holder to collect detritus and build up a colony of beneficial bacteria that breaks down harmful waste materials in your aquarium, resulting in a cleaner living environment for your fish. Ideal for breeding & spawning freshwater fish and shrimp Ideal for Discus and Angel fish Telescopic height adjustment Provides