GSP green star polyp. That is just my guess, but they suck in like that and grow in mats and judging by the actinic photo, the spots that glow are the polyps trying to open.
Yes it out grows things but really you can just pull it off and toss. It's not like the leathers or Xenia it doesn't drop off parts it just expands. I isolate it on a rock and just keep it surrounded by sand it doesn't stop it from spreading but it does leave me time to catch it before it spreads.
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