I think its a some time of pest just a young one majono anemone. The local fish store has a tank loaded with them and they cant keep corals because they spread like wild fire and sting the hell out of corals. they have a wand type tool they use to remove them, its has a electric charge or something to separate them. I could be wrong tho im pretty new to this hobby
You i'm not sure if its bad for sure but i think i found something like what you got online here is the link it http://www.underwater-photos.com/pw035.html check it out maybe if your rock came from the same are you got lucky
It looks really pretty but that may just be the quality of the photo :X The only aquarium store near me has a bad aiptasia problem and even tried to sell one of the larger ones as a coral with the actual name 'aiptasia' labeled on it...
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