Thing growing next to feather duster

[ReefWitch]

Hey yall. I woke up this morning to find this thing next to my feather duster growing on the rock. It looks like a somewhat opaque hollow ball with two tubes growing out the front.

Is this just my feather worm reproducing? Or is it something I need to be worried about?

 

[ReefWitch]

To my knowledge the feather duster is perfectly healthy. It shed its crown over the holidays but it grew back. Aside from that nothing new, I've had it for almost 4 months now.

 

[cpoynter]

Looks like a tunicate