Help ID this algae

[Aeb1419]

I am currently battling GHA for about 2 months now and its been going swell. Reducing nitrates and phosphates by decreasing lighting time, turning up skimmer, less feeding, more freqent water changes, and increasing lighting time in the refugium has been helping alot.

But now I have ths algae thats string like growing inbetween the rocks. Looks like chaeto kind of. Seems to be growing fast, any idea what it is?

 

[Tahoe61]

It could very well be Chaeto. I have had it come in on frags and grow.
An Urchin would take care of the green algae, as would an Abalone.

 

[Faurek]

That is not chaeto, chaeto doesn't anchor, you will have to wait and see what it turns out to be, but looks like a macroalgae of sort.