The Mag-Float Glass, Acrylic & Plastic Floating Magnetic Aquarium Cleaner lets you remove algae from glass, plastic, or acrylic aquariums without getting your hands wet. The Mag-Float consists of two powerful magnet pieces that are covered in non-toxic plastic. The magnet that goes inside the tank has a fuzzy fastener on one side, and the outside magnet has felt. As you move the outer magnet, the abrasive fuzzy fastener magnet follows and scrubs the tank as it moves along. That means you can stay dry while you clean, and you won’t have to worry about knocking over decorations or damaging corals or invertebrates. If the two magnets separate, the inner piece will float for easy retrieval. The plastic cover keeps the magnets rust-free, so you can leave them attached to the tank for practical storage.
Nano - Recommended for small aquariums on a glass thickness of 3/16" or 5mm.