worm identification

[JachPot]

Sorry the picture is through dirty glass, I've been going through some of the uglies and just letting it ride. Trying to determine what kind of worm I have here and if it's stinging the acan it's attached to the base of. The acan doesn't look very happy and there is something white coming off of it

 

[Hoodstream]

Hydroid maybe?

 

[MaxTremors]

Fan worm, harmless filter feeder.