1. Only for Glass Tank: mini size, perfect for under 20 gallon aquarium. Suitable for less than 3-5mm thickness glass fish tank, but Not for Acrylic or Plastic Tank. Can be used in fresh water or salt water.
2. 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.
3. 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.
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