I would imagine at some point it would probably break down at the seams first.
As an aside, I seem to have one of those clear containers that strawberries come in wedged in the back of my tank under a rock. I was using it as a frag holder a number of months ago. I'm not quite sure how it managed to get back there without any frags in it but then again who knows. I'm not quite sure how to get it out without tearing the tank down so it may just have to live there for awhile until I move the tank. Hopefully it isn't doing anything crazy in there
