I think it's Pachyclavularia sp., almost certainly Pachyclavularia violacea. The name seems interchangeable with Briareum violacea. There needs to be a Fishbase for corals. 
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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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