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as someone who has an aquarium, i'm amazed it didn't happen in the middle of the night. Any time I've had an overflow issue or something, it's always in the middle of the night and my water sensor is blaring

I’m renting a house with three bathrooms. Two of the three toilets, on separate occasions, spontaneously cracked and leaked water. Both happened between 5am and 6am-ish. I was awake for one and heard it, and woke up shortly after the other one happened and found my kitchen flooded. The cracks in the two toilet water tanks were identical. Given the comments about the water temp and lobby temps, I’m guessing that hour and temperature changes could be linked.

I was able to get the owner of the house to see the wisdom of replacing the third toilet water tank.

Yes, it could have been much worse if it had happened at, say, 6PM. Although some hotel lobbies can start to get busy even at that hour (airport hotels, etc).

even earlier, 5:30-5:45 actually reported by guests, 5:43 fire alarm after broken front glass

preliminary cause - material fatigue