This Fish Tank Bubble Ornament Clam Decor will make your aquarium more beautiful! It is compatible with 4mm flexible air pump tubes! This product doesn’t only serve as an ornament but also offers a function. Once you connect it to an air pump, it will release bubbles that will increase oxygen levels in your water. At the same time, it will lower CO2 and improve PH levels which is important in keeping fishes healthy. It is a good way to incorporate bubbles into your tank.