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It is much better for the tank to get cold than for it to overheat.
I had the same thing happen when I went to get married. Came home and found my tank at 63 degrees. It had been that way for a week. All fish survived. All coral survived. My blue tort bleached and I thought it was dead. I decided to leave it in the tank and it is a good thing that I did as it survived.
Good luck.
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