Just a quick update: Since the coco worm has been coming to the top of the tube much more often, I've had a chance to really look at it. It appears that there are two nubs with a few tiny feathers growing out from where the two heads used to be. I could be wrong, but I think that they are growing back
. Was the transfer from the pet store to my tank that stressful, or do these worms often shed their heads?