What is this?

[Springapple]

I feel like it has been growing on my coral. Any thoughts on what it is? The dark brown thing is like a hard shell.

 

[neonreef3d]

hard to say, looks like some type of Zoa

 

[shakacuz]

my first thought is a vermetid snail, or spirorbid worm

 

[ISpeakForTheSeas]

I feel like it has been growing on my coral. Any thoughts on what it is? The dark brown thing is like a hard shell.

Can you get some pics of it under white light?