The NanoMag from Two Little Fishies is a small, simple, high-energy window cleaning device. Its patented design offers flexibility and a slim profile that fits securely between polyps or plants and viewing windows. It has the volume to clean glass up to 1/2" thick. The NanoMag also glides over the curved surfaces of fish bowls, easily wiping away algae films, and it's so much fun to use that you may have to take turns.