Zoanthid and paly colonies (one of each in close proximity)

Looks hairy to me; I don't know what it is but I'd guess a hair algae, Bryopsis?


Specs
75 G, 4 40W NO bulbs (2 10K and 2 act., 2 mo. old), sump with bioballs, 75# of live rock, a friend's well established tank (years) but had to be relocated to my house about 10 weeks ago. plenty of current but not directly tuned in to those colonies, RO water for topoff and changes

250 DE pendant waiting for installation (I've heard to expect more algae when it goes online - another thread soon)

ammonia, nitrites and nitrates all reading zero with dipstick, No phosphates as of about three weeks ago (LFS test). wouldn't say I am a heavy feeder.

Gotta start snipping. After that, just put em back in?