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I don't like the looks of it. May be a infection. I would get the advice from some of the experts that post here. But at a minimum my guess is there will be a dip of some kind needed.
Could be Beggiatoa sp. infection, a pic underwater would make me certain because I don't know how it looks exactly above water. Almost invariably results in death.
Yeah a friend of mine a fellow reefer come round to take a look. Said it was an infection aswell.
Currently in his quarantine under iodine solution but the stuff on it spred fast I've resigned myself to that coral being dead