Check the listing for details. AQUEON Algae Cleaning Magnet Glass Acrylic Small , Medium or Large. Condition: New. Listed at 13.99 USD. AQUEON Algae Cleaning Magnet Auction is for ( 1 ) : AQUEON Algae Cleaning Magnet The Algae Cleaning Magnets from Aqueon are an easy solution to effectively remove algae from all sides of the aquarium. No need to throw out the entire magnet cleaner when pads become worn down. Simply click a new pad on to the magnet for quick and easy replacement. For either glass or acrylic aquarium use. Remove unsightly algae from aquarium walls.Magnet makes it easy to clean the inside of the aquariums from the outside.Weighted scrubber will not float away !Scrubber falls straight down if separated from magnet for easy retrieval. SMALL - For aquariums up to 20 gallons or 1/4 inch thick MEDIUM - For aquariums up to 125 gallons or 3/8 inch thick LARGE - For aquariums up to 300 gallons or 3/4 inch thick Do not use glass pad on acrylic or plastic aquarium surfaces. Please feel free to contact me for International and combined auction shipping rates or with any questions or concerns that you may have about my product. Thank you !