Flipper Aquarium Algae Magnet Cleaner
Flipper can be used on glass or acrylic tanks up to 12mm (1/2") thickness Flipper's patented design creates the only aquarium cleaner that can FLIP from scrubber to scraper simply by rotating the handle.  Complete cleaning without ever getting your hands wet! .Each Flipper includes two blades:Metal blade: Use only on glass tanks.Plastic blade: Made for acrylic tanks.