I appreciate everyone's tips. I did some research and was told by several sources not to use nail polish remover or acetate on acrylic. It will soften the acrylic and will most likely cause serious damage.
I read about the razor blade method and then using a buffer to get the scratches out. However, someone mentioned that they had a similar problem and used a Mr. Clean Magic Eraser to remove the glue. I was skeptical, but after wetting the magic eraser and scrubbing a bit, it removed the majority of the glue without causing any additional scratches. When the lights are off, I can still see a faded marking where the glue was, but I don't see it when my tank lights are on. Thanks again.