Maybe this info. will help.
I have tried moving several on two different occasions to different tanks. Once, I think I grabbed the "tube" but the worm inside gave me the slip. The other time, I made sure to dig deeper, to get the whole thing, but they never reappeared after the move. But in the tank where they are abundant, where the others came from, I have seen tubes broken off and they regrow, I have seen them move, nothing seems to stop them. For me, it's just moving them that always seems to kill them.