Is this bryopsis?

[Colt13]

Wiry green algae growing on rocks and out of sand. I think it came in on a frag plug

 

[vetteguy53081]

The beginning of it. Pull as muc as you can by hand and reduce whilte light intensity a little.
You must remove the roots or they will return. Take scraper or credit card and removed it thoughly and you should have nipped in the bud