those sps that survive and don't continue to shed tissue will likely recover (barring any further tank/heat issues) and may grow over the old skeleton, they may also just continue to grow new branches etc and the exposed part of the skeleton might just remain dead looking.
as for getting some life back in your rock, I'd suggest that bacteria in a bottle stuff (like cycle or stability). I used some for my tank crash and it seems to have done the trick or at least helped out as I haven't seen any really ugly algae blooms other than the usual crap on the glass.
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