is the tank empty or full? outside or inside? Basically you have to start with 200-400 grit sand paper and work your way up to 6000-12000 grit and then buff with a product like novus#2. Look for a product called micromesh, this is the sandpaper you will need.
micro mesh is the way to go... they make kits with all the product that you need... I used Novus on my 1st acrylic tank. It was good for small scratches. The micro mesh will take care off bigger scratches.
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