In captivity, hermit crabs are omnivorous and eat hermit crab pellets, as well as fruits such as apples, bananas, and grapes, and green vegetables such as kale and broccoli. They also eat calcium supplements such as crushed oyster shells and cuttlefish bone.
Hermit crabs are nocturnal, meaning they like to eat mostly at night. They also prefer to eat their food slowly. Chopping the food into small bits helps them eat. For small crabs, crushing hermit crab pellets into powder is helpful.
Hermit crabs are also sensitive to metal and chlorine, and need filtered, non-chlorinated water to drink from a non metallic bowl.