Hollow tube coming out of zoa?

Mr.C

New member
Hey guys.. Anyone know what this tube looking thing coming out of one of my zoanthid colony is? Here is the best pic I could get with my iPhone...
C0C1D42C-24F4-45E8-9A4B-EB42EFBE6FEB.jpg
:uhoh2:
 
I had yellow sponges in my tank that would have little clear tubes like that. Can you see anything when they close up?
 
I've seen these before in my sump and also on some zoanthid colonies. I believe it's just a little feather duster.
 
I'm not sure, I just noticed it today while I was cleaning the glass. It doesn't seem to be troubling them at all.
 
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