So I was a good boy and did my regularly scheduled maintenance tonight. Test/clean glass/waterchange So I whip out the handy dandy trusty dusty magfloat with the razor blade attachment. Set the blade to scrape and whammo! I have got several new HUGE new and very noticeable scratches across the front pane of glass. Turns out that I set the razor too deep inadvertantly and the corner of the blade put those lovely new gouges in the glass. Be forewarned.