Any idea what this is?

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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?

4C7AEAB4-5BE1-4EE6-9557-67DBA4C78959.jpeg


F8324D84-4AA8-44D5-97F7-1D361E2998AA.jpeg
 
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James M

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Looks like Green hair algae
 

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