Check the listing for details. Aqueon Algae Cleaning Magnet Small Cleans Glass and Acrylic Surfaces. Condition: New. Listed at 16.99 USD. Aqueon Algae Cleaning Magnet Small Aqueon Algae Cleaning Magnets are an easy solution to effectively remove algae from inside of the aquarium walls. One piece has a scrubbing side for removing algae inside of the aquarium, while the other part magnetically attaches from the outside. Each algae cleaning magnet comes with one pad for glass aquariums and one pad for acrylic aquariums. The inside scrubber magnet is bottom-weighted that will fall straight down if separated. The bowed bottom design allows the scrub pad to rest above the gravel for easy retrieval while reducing the risk of scratching the aquarium walls. Three different sizes to accommodate various glass and acrylic aquariums. Remove unsightly algae from aquarium walls.Magnet makes it easy to clean the inside of the aquariums from the outside.Weighted scrubber will not float away!Scrubber falls straight down if separated from magnet for easy retrieval.Both a glass and acrylic scrubber pad included.Ideal for glass or acrylic aquariums up to 20 gallons or 1/4 thickness.Size: Small