Two Little Fishies' NanoMag is an itsy-bitsy, lean, high-energy, window-cleaning apparatus. Its patented design provides flexibility and a slender profile that slips safely between polyps or plants and viewing windows. It�s got the umph needed for cleaning glass up to 1/2� thick. The NanoMag also glides across the curved surfaces of fish bowls, wiping off algal films with ease, and it�s so much fun to use you just might have to take turns.