Sump tank busted in the middle of the night.

[Fishster]

Sorry to hear about your disaster. Did the seal break or did the glass break? If it was the glass I would say that you should add foam to the bottom to even out any imperfections. It sound kind of like a pressure point somewhere on the tank. If it was the seal then it probably is related to unclean glass at the time it was built. Either way it still sucks.