Only for Glass Tank: Measures 1.8 x 1.8 x 2.3 inch, perfect for under 20 gallon aquarium. Suitable for less than 3/5 inch thickness glass fish tank, but Not for Acrylic or Plastic Tank. Can be used in fresh water or salt water.
Float up if Detached: The scraper floats so it will not sink to the bottom of the tank. Just push it to the side and reattract without disturbing any of your aquatic animals or plants or getting your hands wet.
Efficient Algae Scraper: The inner abrasive velcro can effectively remove hard algae and will not scratch glass. The external soft pad scrubs the dust outside of aquarium. Be sure that nothing gets stuck to the magnet substrate while scraping the tank.
Easy to Move Around: Moving the external magnet while the internal magnetic brush will follow to clean with ease which will save your time. 2 inch large round square cleaning surface can go around small corners without detaching.
Non-Slip Design: Ergonomic concave design is suitable for palm gripping to make the brush move flexibly. Strong magnetism makes the 2 magnet pieces attached to the wall tightly without falling off.