i dont know specifically about the bobbit worm but i posted a while back and had a bad infestation of bristle worms.... i mean huge and all over !!! They would reproduce fast as i feed a lot to keep my angels from picking at corals... They got out of control...
That Blue Spiny lobster i added, decimated them!!!
Not sure if that helps any...
Finny, I had one in my tank that was slightly bigger than the one you had. it essentially wiped out my tank. found him and got him out last march (?) My tank sat idle until december, and i dont see any signs of evil bobbit babies or coral and fish missing now that im re-established for a few months now.