Type of hair algae?

[jd06351]

Hi all, is this some kind of hair algae? It's not hydroids, just single strands of green string like algae, but I can't find anything matching it on any searches.

 

[KJ]

Look like chetomorpha algea.

chaetomorpha algae - - Image Search Results

images.search.yahoo.com

 

[jd06351]

Look like chetomorpha algea.

chaetomorpha algae - - Image Search Results

images.search.yahoo.com

I thought it was at first, but it's very fine and is growing from the rock. I didn't think chaeto rooted itself.