Did you dip the frag before you added it? perhaps this did some damage although it doesnt explain the rest of the corals. I doubt chloramine is the problem or else you would have sick fish too, although mabey you levels are still low. Try an ammonia test. Do you have a TDS reading from your RODI, mabey your membrane is shot? Try running a different salt and definately run Carbon 24/7. Another thing you should try is routing your skimmer air intake outside the house. It could be related to new/old house syndrome, cooking,do you smoke? almost anything but you did state it all started when you moved so most likely its either the air or the water at the new house.
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