Maybe you have already read the post to chris on the diy forum, incase you haven't go to oregonreef.com
Can you believe I have one of these and I'm feeding it on purpose. But mines not that big yet. It is really pretty cool to watch and feed.
Sam is your Eunice"bobbit" worms in your main tank or your sump or another tank? Some post say big ones can grab a fish... but not 100% sure... http://reefkeeping.com/issues/2003-04/rs/index.php
Its in the frag tank refugium. There is only one other fish in that tank and so far the fish stays at the top of the tank and the worm stays at the bottom.