Thanks for the ID! I hope it survives, it is pretty cool. That said, if it insists on darting around the surface of the water when it comes out at night, it is going to be sucked down into the sump and most likely eventually caught up in the return pump.
From some quick reading about it, I wonder if I also have the worm that spawned this thing, or if it was just a hitch hiker that arrived yesterday on some TBS rock. Either way, looks like it won't be around for long ....
Thanks again!