Take some very clear pictures, and contact the manufacturer. Try to get some shots from above, so the pics show the degree of curvature. They will tell you if you are about to have a problem. You may have to call them...emails do not seem to often result in actual contact, but if you can get someone's email address over the phone you can then send them the pictures.
Having had a 90 gallon tank crack and empty a few years ago, I would suggest that you waste no time...big, big, mess.
DO NOT squeeze it any more! That will just add stress, and hasten a possible problem.