Penn-Plax Deco-Replicas Aerating Lighthouse with Beads. This functional ornament brings a natural, yet playful atmosphere to any tank or aquarium. Great for Freshwater and Saltwater applications. The top contains bright and colorful beads that continuously move as the air flows from the aeration system, providing your tank with additional movement and action, for you, as well as your fish. Oxygenate your tank with the Deco-Replicas Aerating Lighthouse. This ornament goes beyond just aesthetics; it’s fully functional. Connects to an air pump and a check valve via line tubing. Please Note that Air Pump, Line Tubing, and Check Valve not included. This ornament is inspected with your fish’s safety in mind; material is safe for both freshwater and saltwater aquariums. With a finely constructed base, you don’t need to worry about it floating around once you place it underwater. Measurements: The Lighthouse’s height is 7.5”; Bottom Base is 4” (W) x 2.75” (D); Top is 2” (Dia)