4 pcs Bio Sponge Filter Betta Fry Aquarium Fish Tank Double Sponge up to 55 Gal
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The Double Sponge Biofiltration System for Healthy Aquariums is a budget-friendly option for those looking to maintain a clean and healthy environment for their fish. This sponge filter provides both mechanical and biological filtration, trapping larger waste particles while also facilitating the nitrogen cycle through the colonization of aerobic bacteria. It can be installed easily with an airline and used as a breeding or secondary filter, or as a pre-filtration unit by fitting it to an external or top filter. The large size model (#XY-2822) is suitable for tanks up to 55 gallons and includes four pieces of sponge filter.
A sponge filter uses bubbles of air from an external air pump, or an integral water pump to draw water through the sponge. As water is drawn out through the lift tube or pump, it is replaced by water entering the sponge.
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