I have a JBJ 28 that was literally covered in coral when I bought it 9 months ago. The weekly razor blade maintenance was driving me crazy so I bought this unit. Some reviews made me concerned about the effectiveness of this device against calcareous algae, but I was very satisfied after the first use. He removed a lot of coralline algae after several passes. I find that consistent use of this product will save me the trouble of getting that razor blade back to my glass. Coral stains larger than an eraser will not be removed with this device. A lot of reviews have complained about not getting around the corners of the tank, but I was able to work around the entire tank (curved corners) without losing the magnet.
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