I can't really tell what's going on there, but it may be that your caulerpa has gone sexual. A better pic would help though. Also from that pic it looks more like chaeto to me than caulerpa, but again I can't really tell.
It could be chaetomorph. It came when I got the tank from a friend so I don't know for sure. I'll see if I can get a better picture. It's hard to get a good one back there with my halide in the way; it limits mobility and creates a reflection so you can only see it from some angles.
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