can I cut off feather duster tube?
I've got a hawaiian feather duster that, shortly after arrival, broke through his "tube" and made a new tube to achor himself deeper in the sand. Now the old tube has worked its way to the surface, and just flaps in the current. It's gross looking -- can I cut it off since the worm no longer uses it? I know it's not part of the worm & won't hurt it, but I'm not sure if having a small open space like that will be bad for it, or if it will just cover it over again.