Betta Air Disks are flat air stones suitable for placing on bottom of an aquarium or pond. They create a column of air bubbles to decorate, aerate and improve water circulation. To install, connect to standard (4/6mm) silicone or plastic air line from the air pump and lay anywhere in the aquarium or pond. The stone can be hidden from view using rocks, plants or other decor etc. Recommended for use with Betta Airline Tubing, made from either silicone or plastic.