Any ideas what this may be?

[mark cid]

I’ve noticed some of my zoas getting these brownish black bushes growing in and through them. Any ideas on what they are and how to stop/get rid of them? Are they harmful? Should I dip the zoa to kill off this pest?

 

[hdsoftail1065]

I’ve noticed some of my zoas getting these brownish black bushes growing in and through them. Any ideas on what they are and how to stop/get rid of them? Are they harmful? Should I dip the zoa to kill off this pest?

Pics might help figure out what your dealing with.

 

[mark cid]

Pics might help figure out what your dealing with.

 

[hdsoftail1065]

Looks like clumps of GHA.