Aqueon ProScraper 3.0 Adjustable Algae Scraper Blades can easily be replaced or changed with Twist & Click design. Stainless Steel Replacement Blade is great for hard to remove buildup from glass aquariums and is rust resistant. Plastic Replacement Blade reduces the risk of scratching walls and is great for acrylic or delicate glass.. Snap off Frozen Food & Seaweed Feeder, place frozen food or seaweed into head and snap cover back on for feeding. Rubberized grip to reduce slipping when wet; designed to properly fit the palm of your hand. Strong fiberglass handle provides the proper leverage for any cleaning job and resists corrosion for a lifetime of use