Two problems here: first, they're ambush predators, and you can't really train them to come out and say hello once a day. Second, I don't know anyone that stocks marine bait fish, and I'm not sure that I'd just want a marine tank full of mollies and a eunicid worm -- wouldn't that essentially just be a freshwater tank with something grabby that lives in the substrate?
I think I'd rather go for an eel if I wanted something long and ravenous. At least they're (relatively) personable. But if you do go for a bobbit tank, post pics! I'm sure it'll be a hit here.