This 4" diameter Imagitarium Bubbling Ring Airstone helps beautify your aquarium by increasing oxygen levels, aerating water and improving circulation with a attractive frenzy of tiny bubbles. Soothing bubbles enhance aquarium water movement and gas exchange for improved water quality. Partner it with other bubbling accessories to help create an optimal environment for your aquatic pets. Airstones attach easily with standard airline tubing. Suitable for freshwater or saltwater aquariums.