[Reefmaster]

our 90g did something similar once - this may seem obvious, but in case you haven't considered it. if you lower the temp rapidly you will cause more bad to happen by the rapid drop. you might try get it down to 90 fairly quickly then drop it slowly maybe a half a degree an hour, or back to 80 overnight. i'm not certain bout sps, but i know the others can tolerate up to 88 or 90 if done slowly. just a thought i expect you considered already. good luck. shane