Aqua One Air Stones provide ample oxygen and water movement, assist in releasing carbon dioxide build-ups and add an aesthetically pleasing element to your aquarium. Features & Benefits: Provides ample oxygen and water movement within your aquarium Assists in releasing carbon dioxide build-up Releases a constant stream of fine small bubbles that will not disturb your aquatic inhabitants Encourages healthy bacteria growth Adds an aesthetically pleasing element to your aquarium display Can attract active schooling fish and strong swimmers who often like to play with small bubble currents Intended to be used with an air pump, check valve and airline tubing Available in various sizes and styles Suitable for: Coldwater and Tropical Available in: Airstone Ceramic 80x20mm Airstone Ceramic 80x30mm Airstone Ceramic 100x30mm Airstone Ceramic 130x30mm Airstone Flexible 90cm