Just bought this trachy. I dipped in Coral rx. Didn't see any hitchhikers. Saw what I thought was an old worm skeleton. You can see a lot of it on the bottom side. I assumed it was dead. Looking just now i see this. Appears reddish in color and i can see at least 2 whatever it is sticking out. Christmas tree worm perhaps is my first guess, but I really have no idea. Sorry for bad picture. Phone is about to die so no flash and light are switching to moon.