GRENCO 4" 100 MM Aquarium Air Stone  (6 Stones)

An Air Stone, whose purpose is to gradually diffuse air into the tank and provide oxygen for fish to breathe, is a necessity to have around your Biofloc Fish Farming Tank and aquarium. It’s also a must have for Hydroponic and Circulation system. GRENCO Air Stones are made of high quality non-toxic mineral material, with high temperature splintering, stones are sturdy and durable, have high dissolved oxygen rate and create even and tiny bubbles rather than a limited number of large ones. BEFORE USE: You have to soak it in water for about 6 hours before connecting to an Air Pump. Package Contain: 6 X 4 Inch Cylinder Air Stone with Brass Nozzle suitable for 1X10000 Ltr Biofloc Tank.