That pic you posted is my coral. That was under 400w Reeflux 12k. at mid level of the tank. At the time my nutrients were way too low, so that's why you see the light tan on top.
I got it wild also.........this was when it was about 5" in diameter and about 6" from the top under 400w halides. It was sitting off center under a Lumenarc reflector.
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It had AEFW about 6 years ago and I would see it sliming from underneath trapping bubbles. The top color never changed.
Hope that helps