Glass aquarium cleaner Recommend to be used on aquarium surfaces up to ¾” (20mm) surface. Product dimensions: (4 ½” x 2 ½” x 1”) Lets you easily and smoothly remove algae and scrap off dirt from aquarium surfaces Cleaning without knocking over decorations or damaging corals and invertebrates Your hands stay dry while algae are scrapped off Removes algae quicker than other tools Does not scratch aquarium tank surface Removes a massive amount of algae and dirt in one swipe Strong neodymium magnets ensures the Mag-Float cleans reliably without separating apart Magnets with lifetime durability that remains strong over time. Designed for freshwater and saltwater tanks. Will not rust. Mag-Float can be left attached to your aquarium surface at all times. Made of toxic-free material, safe for fishes. Use regularly and your fish tank surfaces will remain clear and transparent.