Mag-Float floating magnet cleaner for aquarium glasses up to approx. 10 mm glass. The Algae magnet cleaner sinks not to the ground but is floating upward, to the water surface, if the connection to the outer part is lost. Can also be used on acrylic aquarium glasses. Dimensions: 100x35x65 mm+ Easy removal of algae from glass/acrylic surfaces+ No lo..