Hey guys, I just today put my live rock in my tank with my live sand. I have a few hitchhikers I am curious about and that I can't identify. I know these pictures aren't ideally clear since they were taken with my phone, but I think you can kinda still see.
The first is what I THINK might be a eunicid worm. It actually looks like 2 crossed over another.
This one is just poking out of the rock, not sure what it could be.
This has hairlike tentacles going out from a circular base.
Again, sorry for the less than good quality pictures.