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I think it's a majano anemone, but I would wait for someone with a little more specific knowledge on those to chime in. If so, they are generally considered pests, although they are pretty in my opinion.
looks like an anemome. from pics i have seen, could be a small magnificent anemome. in your pics it looks like the colors are purple and blue. did i come on some LR or u buy it at a LFS?