Steve I think it's some type of polyp. I have them as well, although not that large. They don't seem to be a problem, as I have a few right next to some hitchhiker zoanthids and neither looks worse for the wear.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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