Seachem Algae Pads are professional quality non-scratch algae pads for glass and acrylic aquariums. Made with melamine foam, which utilize micro abrasive technology to effortlessly remove algae from the sides of your aquarium. The texture of these pads even removes algae from scratches in aquarium walls. Chemically inert and made without the use of soaps or detergents, Seachem's Algae Pads will not leave any negative impact on your aquarium. The white color makes spotting leftover algae simple, allowing you to keep scrubbing until an area is fully clean.