What do you all do? I was thinking about letting it cover my back wall, but then I wasn't so sure how the tank would look with a pinkish back wall. As you can see in this picture, it is getting pretty spotted, so if I'm going to scrape it, I should soon. My boss told me that his tank was covered in coraline (back and sides), and his wife scraped it one day when he was at work. He said his tank crashed because of it. If I decide to scrape, should I do just a little at a time?