Glass aquarium cleaner Recommend to be used on aquarium surfaces up to ¾” (20mm) surface. Product dimensions: (4 ½” x 2 ½” x 1”) Item #00400 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