I have lots of scratches on my used tank, they were caused by a brillo brush, the previous owner was a moron and scrubbed the glass with a very harsh pad, so i have millions of swril marks, but after I filled it up with water, it looks a lot better, but not as good as i would like it but hey, i got a really good deal so i shouldnt complain. Anyway, i invested in a scratch removal kit for glass, it would work but it takes about 4 - 5 hours of rubbing and back breaking work to remove a 3inch by 3inch square of scratches on glass. I say its not worth it. If you fill it with water the scratches almost disappear. Good luck.