I enjoy my acrylic tank, and agree bare bottom reduces the possibility of scratches; you just have to be careful. I have scratched acrylic tanks before and it only takes 10 minutes to remove them in my experience. I also have had glass tanks which you still can scratch and if you do there isn't any easy method of removing them that I know of. The key is stay away from sand and go bare bottom and it's very easy to keep it scratch free in my opinion.