coral bleaching?

its been a while since i posted, everythings been going fine until recently my tanks heater got stuck on and i didnt catch it until i noticed my corals were unhappy. now ive got some colts, toadstool, and frogspawns that look like they are bleached. will they come back from this or are they doomed? theve looked this way for about a week now. also what does everyone else run there temps at in there tanks? since this happened i havent been able to get my temp down below 81, i dont have a chiller at the moment.

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coral bleaching?

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