Clean the inside of your tank without getting your hands wet! Magnets sandwich glass between cleaning pads and safely removes algae from glass tanks.
Instructions: Separate the magnets. Slide the outside magnet across the glass to easily remove algae spots. Place the magnet with the rough surface inside the tank. Place the magnet with the felt surface on the outside of the tank. If the inside magnet falls to the bottom, you can easily raise it by working the outside magnet.