Check the listing for details. Seachem Algae Scraper 12" inch 3 in 1 Algae Scraper for Glass & Acrylic Aquarium. Condition: New. Listed at 21.99 USD. Seachem Algae Scraper 12" inches. The 3 in 1 Algae Scraper for glass and acrylic aquariums.The Seachem Algae Scraper is designed with versatility in mind. With three retractable blades: metal, plastic, and soft pad, it is suited for both glass and acrylic aquariums. It is lightweight and features an ergonomic handle making it comfortable to hold in multiple positions. In addition, it floats for easy retrieval. Finally, its white color makes it easy to see the algae you want to remove and when you’ve effectively removed it.Features:Ergonomic handle allows for easy use in multiple positions.Retractable blade housing safely hides blade while not is use.White design contrasts with algae so you can see what you are removing.Floats for easy retrieval.Handle hole for hanging storage.3 in 1 Design:Metal: Easily removes tough algae in glass aquariums. Not for use on acrylic.Plastic: Safe for use on glass and acrylic. Use care at gravel line to avoid scratching acrylic.Soft Pad: Your first choice for acrylic aquariums. Easily removes algae from scratches.Retractable Blade:Safely hide blade when not in use.Easily switch between metal blade and soft pad. Simply slide the cartridge out of the scraper head, flip, and re-insert.Choose from two blade positions/heights.Size: 12" inches