I was recently in the process of cleaning the front glass of my tank but didn't check the outside magnet very close and I got a deep scratch all the way across the tank and of course it was dead center! I started researching ways of repairing it but found that some glass shops would try but I had to bring it in, ya right!! :-X I kept searching and found an outfit that sells a kit to do it yourself. I bought a kit then went back and bought more agressive pads (had a deep scratch) and it's WORKING!! ;D It's not real easy but it does work. I've spent about four hours at it so far grinding out the deep part (I work slow in 15 to 20 min shifts, old fart :-[) I'll keep all informed of my progress. Here's the link to my source DIY Glass Scratch Repair | Glass Scratch Removal Equipment & Supplies | Gtglass | Glass Technology, Inc.