ID help. What are these? Algae? Some sort of worm?

[Coco Go]

 

[1clownfish]

Oh that’s very interesting I have never seen it before

 

[sixty_reefer]

It seems to be some sort of hydroids, maybe zanclea. Is it only on this frag or all over the tank?

 

[blaxsun]

Oh that’s very interesting I have never seen it before

Nope - me neither (then again, I never get any of the 'cool' stuff in my tank).

 

[MaxTremors]

They look like hydroids.

 

[Coco Go]

Yup only on this particular frag.

It seems to be some sort of hydroids, maybe zanclea. Is it only on this frag or all over the tank?