Aqueon Algae Cleaning Magnets are great for cleaning algae off of the walls of your glass or acrylic tank. These magnets are weighted so that they fall straight to the bottom of the tank after separation instead of floating around. Replacement pads are available for purchase, so there is not need to purchase a whole new scrubber when the pad wears out.
Small Magnet: For tanks up to 20 gallons or 1/4in thickness. Approximate dimensions are 3in long x 1.5in wide x 2.25in thick (acutal scrubber thickness is about 1in)
Medium Magnet:For tanks up to 125 gallons or 3/8in thickness. Approximate dimensions are 4in long x 1.75in wide x 2.5in thick (actual scrubber thickness is about 1in)
Large Magnet: For tanks up to 300 gallons or 3/4in thickness. Approximate dimensions are 4.5in long x 2in wide x 2.75 in thick (actual scrubber thickness is about 1.25in)
Rivers to Reef says: If you are looking for keeping your hands dry while scrubbing algae these are for you! They work best on brown algae, if you have algae that is difficult to remove with your nail, then you'll have to be more persistent with these as it will not come off in one pass.
WARNING: These magnets come with both a glass and an acrylic pad. Do not use the more abrasive glass pad on an acrylic tank or you will be in swirl city.