Dymax Mini Algae ScraperThe Dymax Algea Mini Scaper is a dependable tool for eliminating algae and hard water buildup from aquarium walls. It is crafted from eco friendly and recyclable materials, and its gentle sponge is non abrasive, making it safe for use on all aquarium surfaces, including glass, acrylic, plexiglass, and plastic. The replaceable sponge makes it effortless to clean any flat or corner surface.