Was the skeleton that green right away? If so then it has a kind of boring (by "boring" in this case I mean "drilling" and not "uninteresting") algae. Basically if SPS sloughs off tissue (RTN or STN) and the skeleton isn't pure white, then the coral has this and it will have a pretty uphill battle ahead of it. If on the other hand it takes a few days then that's just regular old opportunistic algae and not (in and of itself) something to worry about.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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