Marina Flexible LED Air Curtain provides an excellent way of adding visual pizzaz to aquascapes as well as improving water circulation and oxygenation. The air curtain is easy to install - simply submerge and attach it to the bottom of the aquarium and connect an air pump to it. The flexible curtain can be shaped to suit your design needs - you can install it in a straight line to create a breathtaking wall of bubbles and lights or shape it in semi-circle fashion around ornaments, plants or rocks for dazzling visual highlighting. This unit includes 12 Red LED lamps, a low voltage transformer and 4 suction cups. Air pump sold separately. Length: 21 in.