Sorry to hear about your GSP. Yes, 10 mins is too long to leave it in fresh water - should be no more than 3 mins. I made the mistake of leaving mine in fresh water for about 5 mins and that was too long as well. The tips of the polyps became extremely bright green, as if the actual polyp liquified inside the tubes. Needless to say, the GSP rock didn't survive and I learned the hard way. Would it have recovered? - possibly, but after a week if just started to flake away and I didn't want to risk having extra nitrates in the tank because of dead coral.
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