Can anyone ID this little guy

[need4fish]

Hi,

I just notice this tiny stationary critter on a shell in my FOWLR tank and have no idea what it is, good,bad.
The shell is very close to the glass and is so small I had to use a magnifier in front of my camera phone. Hope
the images are clear enough. One picture shows it open, the other is closed.

Thanks

 

[Jlsardina]

Looks like s small tube worm or feather duster

 

[need4fish]

Thanks. Is it good or bad? Does it spread?

 

[Jlsardina]

Not bad. Filter feeder. As long as its not bothering a coral you are fine

 

[need4fish]

Not bad. Filter feeder. As long as its not bothering a coral you are fine

Great, Thanks. I currently don't have any coral just fish.