The second picture is a close up of his back. He is around 4-6 inches long depending on whether he is stretched or scrunched. I’m assuming some kind of bristle worm... although he dwarfs the other bristles in the tank. I have affectionately names him Herman Munster. Does he appear to be a safe type of worm? He is currently inhabiting my 30 gallon and I’m working on setting up/cycling my 60 gallon. Should I leave him in the 30 or would he be ok to move in the 60 that I am going to SLOWLY build into a reef? Thanks in advance for any help.