zanclea hydroid perhaps
 

After much head-scratching I'm pretty sure one of my newer acro's has Zanclea hydroids living on it.
Here's a link with some info and pics. My camera will not be able to catch these little things properly.

http://reefbuilders.com/2012/03/22/z...roid-acropora/

Does anyone else have any experiences with these? The link leads to an article where the writer is leaning towards pest.
But I have had many odd creatures come and go with the times. I was just thinking of letting things take their route and watching the life cycle progress through my magnifying glass...