hermit crab help

[pilikia404]

i have 10 hermit crabs in my tank and i just found 2 of them ripped out of their shells and i cant find their shells. i also have 2 clowns, a frogspawn and a peppermint shrimp. whats happening to my crabs?

 

[Radcat]

They may of just molted. I freaked out the first time I saw that in my tank.