I have a Bobbit Worm

I spent the evening entertaining it. Put on some music, made it some dinner... I fed it some krill, got a brief video of it grabbing my feeding stick a couple times. It doesn't come out of it's hole very much or for very long. It's shy, but not afraid to poke its head out for food, or the potential of food. I moved the zoa colony it's been snacking on, so hopefully that slows down the loss.  At this point I'm going to keep it under observation. It's too small to harm any of my fish, and I've moved my scooter blenny, which is my smallest fish, to my other tank.

unfortunately his nem is huge and is well buried into the rock. 

Something so terrible and hideous should not have been so cutely named. I can only pray to the the aquarium gods that I will never have one of those things into my tank.

Mantis shrimp will not harm corals, there are two distinct types: Smashers and Spearers. Smashers prey on inverts like other shrimp, crabs, etc. While spearers prey mostly on fish. The only real way to tell the difference is to look at the structure of the front legs/pincers. If it looks like a hammer its a smasher, if it looks like...well a spear; it's a spearer.

Just out of curiosity.. Any update?