Algae or feather duster worm on my bubble coral?

[Amart44]

Hello, I noticed a feathery looking think growing from my bubble coral. I do have a little bit of algae that I have been trying to get rid of on the bubble coral, however when I went to remove this, it immediately went into a tube and didn’t come out for a little bit. Is this some kind of algae or is this a feather duster worm?

 

[Bucs20fan]

Looks just like a feather duster or filter feeding tube worm.

 

[Bucs20fan]

Both harmless, good hitch hikers

 

[blaxsun]

It's most likely a feather duster from the description.