Dead coral or ?

[Acipenser]

How long would you give a coral before you figure it's a right off , My leather spent 1 week in a cooler with about 15 lbs of LR and a fish, I turned a CF light on everyday or the cooler and maintained the water . I just transferred the cooler water and 4g new salt water into a Biocube 14. The polyps bounced right back and the fish seams O.K. but the previously happy leather is weathered and cracked and I am wondering how many day's I should give him before I right him off ?