Round Mag-Float :
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. Available for glass and acrylic aquariums.Can be used on freshwater and saltwater tanks. Magnet does not lose strength over time. Easy retrieval of inner magnet.