Do sealed habitats with air holes cause hermit crabs to disappear?

My family was given a gift of 6 hermit crabs with 6 shells in a sealed habitat that has air holes and water. We moved the gift of crabs to a new habitat and found there to only be 4 crabs and 6 shells? Can hermit crabs disappear or can our gift giver count?

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bryteyedgemini says

5 years ago
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