help indentifying fungus/shrub ?

[Haloreef]

I tried the manual removal for a while. It seem to love being pruned and would grow back faster. My hermits did not seem to whant to eat it and the Tangs would not either. I tried a sea hare it was recomended to me( can't remember who) bottom line... I do not have to prune any more. The sea hare passes over any areas with this alge and... poof gone.
Hope this helps.
K.