Great addition to any tank. Additional bubbles assist getting extra oxygen into the water and promotes fish health. Also keeps the water moving. Produces consistent small bubbles. Comes with four suction cups to fix the included approx. 6 feet of tubing to the side of your tank. To Start using right away be sure you have a good air pump on hand to push oxygen to the stone. The stones are perfect size for hiding under sand or small gravel in the bottom of the tank.