Yes, that is the question. I have a 35 year old 75 gallon tank. I fully polished the front "glass", stored the tank, and then tilted it on its front side for some work. when I set it upright, I was a new deep verticle straight scratch about half the length of the front. I don't know if it was done while in storage somehow. I feel no crack on the inside. Could this be a stress crack? :cry:
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