Depends on how deep the scratches are. Mike polished my acrylic tank for me with just a buffing wheel and compound; I was too scared to sand it anyway. There are a couple small scratches that the compound couldn't get out that probably would have needed sanding, but you can't see them unless you are 2" from the panel.
Honestly if you don't have any huge deep scratches, I'd just buff the tank with polish.