Got the Fl!pper for fathers day, and I really like it. It does everything it says it should. Scrapes coraline off the glass with only a few slides back and forth. I have used it several times over the last few weeks and really enjoy the product. Glad to not be sticking my hands in the tank to scrape the glass all the time now. Attached artical and link to where to buy this if you are interested. Hands on with the Flipper magnetic aquarium cleaner and scraper – it floats!