Staghorn hermit has ditched his home

I thought he was dead, but apparently he has been running around the tank naked for 2 days. I found him today and he was attempting to use a feather duster for protection, trying to drag it around. Good thing he's in a super docile tank. Right now he's in a fry tank, eating and exploring. He shows no interest in returning to his staghorn. Anybody got any ideas?
 
Has he out grown it like others hermits out grow their shells? Maybe he needs a bigger home to move into.
 
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