Penn Plax Delux Bubble-Disk

With the Deluxe Bubble-Disk Airstone you can create a beautiful circle of bubbles in your aquarium. The Deluxe Bubble-Disk Airstone provides a fascinating bubble cylinder while aerating your tank. Use in aquarium decorations to create a "volcano" of bubbles. Creates a circle of bubbles for healthy fish Aerates aquarium water Easy to use Directions:1. Attach airline tubing to Bubble-Disk and place in aquarium.2. Allow Bubble-Disk to soak for 15 minutes before turning on air supply3. If after extended use algae build-up reduces airflow, remove from aquarium and clean surface with a stiff brush.