Seashells,
Give us a bit more info on the other inhabitants that you have in the aquarium. What you've provided so far doesn't give us much of a lead.
Were both crabs dead? So the entire crab was there - pieces not missing?
I've had a cleaner shrimp die right in front of me. Just rested on the rock and passed away. Probably malnutrition.
When my hermit crabs molt it LOOKS as if the crab has been ripped in half and eaten - startles me all the time. But later on I find out it's just an empty shell and the crab is all right.
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