How do i know that my hermit crab is about to molt?

Question

my friends hermit crab was holding a shell in its claws and i was wondering if it was seeing if the shell was suitable for it. i dont think it liked it because it put it down and walked away. should my friend get more shells, and fast? or what?

I NEED ANSWERS PEOPLE AND FAST!!!!!!!!!

Answer 1

http://www.hermit-crabs.com/molting.html