Any idea what this one is?

[McBeck]

This came in on a zoanthid rock that I didn't adequately QT. It is soft and "fluffy" and spreads by runners. It will grow on rock, sand, and pvc/plastic. It's extremely invasive. My Rainford's Goby eats it as does my diadema urchin. Any guesses?

 

[graveyardworm]

Caulerpa verticilata.

 

[graveyardworm]

I gotta get the right spelling for ya.

 

[graveyardworm]

Caulerpa verticillata, there's a pic in the slideshow. http://reefkeeping.com/issues/2006-09/reefslides/index.php

 

[McBeck]

I can't believe I missed it. I watched the slide show earlier - must've gotten distracted.

Thanks so much for the ID!