It looks like a colonial tunicate (spelling?) in its early stages, have a look at the pic of the huge specimen I have at post 235 , http://www.thereefuge.com.au/threads/paddling-in-the-pool-a-newbies-first-tank.4167/page-12 .
If you have any, try squirting some reef roids towards him ... he'll look like he is getting the biggest hit of hardcore drugs ever ;)@
chimaera
How long did it take for yours to start fanning?
The berries i guess willl end up being food for the wrasse and CBS.
@daniel borja http://www.reefkeeping.com/issues/2006-02/rhf/