Ball Shaped Aquarium Air Stone Suitable for inner diameter 4mm or 5mm soft tube(optional) Increase oxygen levels, lower CO2 and raise PH. Durable, washable and sintered by temperature. Creates bubbles in fish tank while attached to an air pump(air pump and air tube is not included). It is an important instrument to successfully keep aquatic fish for respiration process. Before use, please immerse it in the water for 15 minutes. IF ANY DOUBTS FEEL FREE TO CONTACT US ON YOTUBE INSTAGRAM CONTACT US
