Glass aquarium cleaner small Recommend to be used on aquariums up to 30 gallons with a surface thickness up to 3/16” Product dimensions: (2 3/8” x 1 3/8” x 1”) Item #00030 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