Anybody knows what this is?

[cb684]

I only found those in this one frag. It was purchased recently and dipped with Revive. It really bleached out, and I thought I was going to loose it. It is getting color back (in the quarantine tank for almost 3 weeks now. Any body knows what this is?
Thanks
CB

 

[cb684]

And just so I am a little more clear, I am talking about these little filamentous structures coming out of the coral.

 

[cb684]

Ok. It looks like those are Zanclea hydroid.