Just wondering what people think is the best way to clean their glass on the inside. I noticed a very small scratch on the inside of my tank and now dont know how I should be cleaning my glass to avoid more scratches. To date, I have been using a razor blade to scrape away. I originally used a mag float but was worried that any of my sand bed might get behind the magfloat and scratch the glass. Any suggestions / best practices to keep the glass pristine? Thanks