The Marina Deluxe Algae Magnet enables you to clean the inside of the aquarium’s glass without getting your hands wet. Its slim design is ideal for hard to reach areas. A large internal scrubbing pad makes it easy to see what you’re cleaning, giving you complete control. The powerful magnets ensure a tight grip and the non-abrasive cleaning pads will not scratch the glass surface. It includes a specially-designed floating magnet retriever. For glass aquariums only. Suitable for fresh or saltwater aquariums.