I think he meant a 2 inch long scratch, that was also DEEP.
Realistic answer, you aren't going to remove significant scratches. If you can catch your fingernail on it, it's a significant scratch. You're better off getting another tank if bothers you.
The well meaning suggestions are often repeated but don't come with proof. I'd love to see a real before and after where someone tackled scratch removal on a glass tank and clearly documented it.
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