What is this on Zoa?

[MB_Reef]

What are these white hairs on this zoa frag causing it to close up?

 

[sunken3]

no idea.. but that's what my finger always looks like after a bristleworm encounter.

 

[Zoa.Mania]

I'd guess bacteria

 

[CheckeredPants]

try to look at it under whites. could be GHA.

 

[ISpeakForTheSeas]

I agree that some pics under white light may help with an ID here. The pic looks like it may be Coral-boring Spionid Worms, but I’ve only seen them in soft corals once before:
https://www.reef2reef.com/threads/what-are-these.973543/#post-11177000

 

[MB_Reef]

Thanks all. Will grab picture under white light when I get home.

 

[Grossman90]

From my many encounters with it, peroxide seems to help but it will go away on it's own. Somebody put the white hairs under a microscope and it was alive. No clue what exactly it is but it always bothers zoas.