Yeah i agree, that smell so typical of nail polish remover is Acetone and it will absolutely rip through the acrylic tank. The smear you see is probably the tank melting a little bit. I know when i was mold injecting computer parts i would use acetone to melt way acrylic scraps. I agree the best bet will be to sand and buff it really good to get it back to where it was. Kind of a pain, but the only option i see. Scraping the super glue will not do anything for you at this point. But at least its on the outside so you don't have to drain the tank to do this!!