Please advise. Open Brain Coral separated from the base

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Open Brain Coral expanded.jpg

Open Brain Coral Separation retracted.jpg

A donation to my new aquarium is this piece of open brain coral. It had receded to half of the base plate before it got to my aquarium and was in pretty rough shape. It did fine for a few weeks and seemed to be growing and looking healthy while the tank has been cycling. Last week it started to separated from the base. When the lights came on it swelled up so much that it was actually pulling itself off the base. It was about 6 hours from when the lights came on until I got home again and watched the last tiny bit let go. I caught it with a fish net and laid it back onto the base in about the right spot. Then wrapped a zip tie around it to hold it in place. I was hoping it would reattach. I assumed it was too much current at the time but if that was the case why would it have done so well for the first few weeks then all of the sudden let go?

Any help on this would be greatly appreciated.