question on a acro

[Budman's Corals]

I got a piece and i keep seeing this thing stick out of it like a feather duster,but its only at 1 spot top left hard to see in pic,What is it

 

[Connie]

It's a barnacle

 

[StevenBell]

Could be a Christmas tree worm...But need a better pic to know for sure

 

[Budman's Corals]

Tenuis Acropora Cora is the coral,but outta one polyp this feather thing keeps coming out

 

[Connie]

Does it look like this?

 

[Budman's Corals]

Well i cant see but the feathers very small looks like its coming out of where a polyp would

 

[Budman's Corals]

Also I dipped all the frags I get