HELP! What is this?

[NanaReefer]

Do a google image search for epitoke, if not that, search for a syllid.

You rock! [emoji1360]

 

[Tristan]

Naw. I wouldn't worry about either of them.

What exactly are they?

I've been trying to find info on them but I can barely find anything.

 

[Lionfish Lair]

As far as an epitoke, it basically the back end of the worm that separates and whose mission in life is to release eggs/sperm.