I've done it, if you have more than one scratch, it's not worth it. I've worked for a Window and Door Company for ten years, buffed out lots of scratches with Cerium Oxide and a high speed buffing tool. It takes a LONG time, and if the glass gets too hot on the buff spot, it could crack from one edge due to stress caused by the expansion. 1 two inch shallow scratch=2 hours of HARD Elbow grease. I scratched the front of my tank, cut the glass out and replaced it with a new one. The sides are still scratched, and it's true that razorblade clean makes it lots less noticeable. Depends how many scratches, and how many you can put up with. Near the bottom or top, why worry?
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