With the Aqua Mist® Add-A-Stone aerating ornaments you can create a beautiful flow of bubbles that will add to your decor while helping to aerate your aquarium. Made of a durable pourous material, each Aqua Mist® Add-A-Stone can be connected to your air pump & tubing (not included) using the standard 3/16" tubing connection to provide an endless stream of bubbles. A second connection allows for the addition of more air stones or ornaments so there is no need to run an additional lines all the way back to your valves or pumps. The Aqua Mist® Add-A-Stone can be set at any angle in your tank, and can be buried without fear of clogging. Approximately 2" wide, these stones are available in 5-1/2" and 10" lengths and will look perfect in your underwater environment.