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Thickening biochemical filter sponge, tough and durable.Moderately hole, can cultivate high density nitrifying bacteria.Can be used repeatedly after cleaning.Can be used in sea water tank, fresh water tank, aqua-plant tank.The size can be cut freely as you need.Good shading features, can reduce the algae breeding.Strong filterability, can stable water quality and reduce fish died.Suggested to clean it every month.Type: Aquarium Filter SpongeColor: BlackMaterial: SpongeWater Type: All Water TypesSize: 50cm x 50cm x 2cm/19.69" x 19.69" x 0.79" (Approx.)Package Includes:1 x Aquarium Filter Sponge