Now with the new version of the 'Small' and 'Medium' glass aquarium cleaners you are able to attach a scraper blade. This additional piece creates the ultimate cleaning tool that will easily eliminate the tougher algae and reach the edges of the gravel and side of the tank! Attaches to the small, medium, and large Mag-Floats Includes two scraper blades Easy removal of algae from glass/acrylic surfaces No longer knock over decorations, damage corals and invertebrates No longer get your hands submerged into the water of the fish tank Time/money saver on maintenance Large cleaning surface area makes the job quick and efficient Stays free of debris Can be maintained attached to aquarium surface Strong, high-quality neodymium rare earth magnets Can be used on freshwater and saltwater tanks Magnet does not lose strength over time Easy retrieval of inner magnet * Information as per Manufacturer