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Aquarium Fish Tank Biological Sponge Filter Media Cotton Air Pump Sponge Aquarium

Features:Quiet & Energy Saving: Only requires an air pump and airline tubing (not included) to work. These create numerous minute bubbles for increased oxygen flow.Biological Cotton Sponge: efficiently break down toxic waste from the tank as the water passes through the pores, leaving the water crystal clear.Improve Water Quality: offers a large surface area for cultivating the nitrifying bacteria, will give you superior biological filtration in your tank.Safe for Small Fish: the slow current from this filter is ideal for fish breeding and spawning, never sucked them up into the filter.Easy to Wash: better clean it with water from the tank (chlorinated tap water can kill the helpful nitrifying bacteria formed in the sponge). Simply rinse and squeeze a few times over until you see the water run clear from the sponge.

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