1. Aquarium Ornaments bring animation and charm to your underwater world while aerating your tank. 2. Each ornament is created with great detail and weighted to help them stay put. 3. Simply connect the ornament to a standard 3/16" airline from your air pump (not included) and watch a steady stream of bubbles rise from the product helping to aerate your tank. 4. While the bubbles escape through this product providing your tank with much needed air. 5. Use your pressure control valve (not included) to adjust the motion and the volume of air. 6. Each ornament is made from a durable plastic resin that is safe for your aquarium. 7. Fun to watch and entertaining for you & your fish,.