I sh!t myself and thought I ruined my new 200G acrylic tank recently. I got some help from guys on the forum, and also had the ADHI owner stop by and give me an opinion on how to fix. I ended up sanding it to 1500 grit, then used novus 3-2-1 (with a flannel rag) to finish. At the end it looked really foggy, but I filled up the tank with water to see how it was coming along. It looked crystal clear to me and I decided not to do any more sanding/buffing. If you can fill it with water to check your results before you go further, you may be very surprised and decide that you've done enough.
But if you can't stop check and decide to keep going, I would just be careful. For me, my whole fiasco started when I tried to do buffing in the beginning (didn't need sanding) and the buffing wheel got away from me for a split second. So be careful, if you've never done this stuff before (newb like me), you could lose all your efforts in a heartbeat.