Throw out all other glass cleaning magnets and long handled scrapers. Or save money and buy this one from the get go if starting out in the hobby. I wish this product was available 13 years ago when I first set up my tank. I would not have the handful of scratches from my old cleaning practices. I can not comment on the effectiveness on acrylic tanks as mine is glass.
July 24, 2016 — Bob Mullaney