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Sabellidae
I found a couple of links, but it's not very helpfull for the exact ID, so I suggest only the species family name ...The first one must be wrong anyway, wiki shows the original Sabellastarte spectabilis. The official site Ausmepa suggests the species was introduced in the Australian waters...
http://coconutislandnews.blogspot.gr/201...
http://en.wikipedia.org/wiki/Sabellastar...
and some more pics from the net
http://www.coral.org/files/images/IMG_16...
http://www.ryanphotographic.com/images/J...