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Can someone ID these things for me please?

2K views 4 replies 4 participants last post by  cooley 
#1 ·
They are the small white sacs with a feather duster-ish fan on them. They are slowly taking over my reef. The rate they are reproducing is starting to worry me. Is there a way to stop them? Any info is greatly appreciated.

 
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#5 ·
Thanks for the responses. Good to know they're not harmful. I guess if they overpopulate, I'll remove them manually.
 
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