Unfortunately no... You need multiple sources amd a good variety so they don't get tired of the same thing offered over and over again.
Protein examples: nuts (peanuts, pecan, almonds, walnuts, etc...), Mealworms, Bloodworms, crickets, grasshoppers, shrimp/krill, lobster, etc..
Calcium examples: egg shells, Cuttlebone, starfish, sand dollars, sea urchin, crushed coral, etc...
Protein and calcium needs to be offered all the time. And they also need a variety of fruits and veges.
Edit: Foods need to be organic as much as possible but here's the safe food list:
http://www.hermitcrabassociation.com/ph ... hp?t=92557
Second edit:
unsafe food list:
http://www.hermitcrabassociation.com/ph ... hp?t=92556
Nutrition link (scroll down you'll find a food pyramid similar to ours):
http://www.hermitcrabassociation.com/ph ... hp?t=92554
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