Can hemit crabs die from over feeding?

[Mako72]

Hello, I have a three week old tank. I have some snails and hermits in it. All the snails have survived, even a peppermint shrimp that is in there as well. However 5 out of 10 of the hermits died off, including a nice electric blue one. Last I saw him, I fed him a small piece of Krill that had been dipped in seachem's vitality (vitamin dip). Any ideas why hermits might die off but not snails or shrimp?

 

[Elysia]

Are you finding the dead hermits in their shells? Are you certain they are not molts?

 

[Mako72]

well, they are just...vanishing, I don't see them anymore. Due to the layout of the live rock, I can visually inspect just about the whole tank, just no trace of half of them, I did find one or two actually dead.