High-Quality Aquarium Fish Tank Filter Bio Sponge & Biochemical Cotton Media Block Foam Pad

This Fish Tank Biochemical Filter Sponge can be used in sea water tank, fresh water tank, aqua-plant tank. -The size can be cut freely as you need. – Thickening Biochemical Filter Sponge, tough and durable. – Good shading features, can reduce the algae breeding. – Moderately hole, can cultivate high density nitrifying bacteria.