After a couple of good water changes, I just left it with lots of GAC running. I found corals I tried to frag just got more stressed and I lost the whole colonies. Once you've got a decent handle on it, wait and see where it goes. Minimal lights for a couple of days too. keep temp a bit lower to increase O2 saturation, and lots of surface agitation.
I'd mix some new water and get the sump going, that will increase O2 uptake as well, and get the skimmer going and clean it as required to keep it empty.
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Brad
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