Help! Got some weird critter growing in my Birdbest

[onefern]

Hello,

Would really appreciate some help identifying this hitchhiker on my bird nest. It’s got two antennas which seem to be coming out of a polyp and coral has turned dark brown around it. Would a Coral dip help?

Appreciate your guys help!

 

[WV Reefer]

Hello,

Would really appreciate some help identifying this hitchhiker on my bird nest. It’s got two antennas which seem to be coming out of a polyp and coral has turned dark brown around it. Would a Coral dip help?

Appreciate your guys help!

Looks like a spionid worm.