Rikko you don't want to fill the scratches though you want to blend them into the surrounding surface. There are many polishing kits available but if you go to an aquarium shop you can find ones that don't use solvent based polishes. It's a lot of work but I've done a couple tanks and it's worth the effort. The kit I used had wet/dry sanding cloth and if I remember right the grit went from 600g-2500 grit in steps. Make sure you read the directions and you'll be fine.
Doug
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