I am a new hermit crab owner so please tell me...What is molting? Is that when the crab takes a new shell? How often do they molt. I have no extra shells. Do you know where I can order some on line or over the phone? edited to add <span class="ev_code_GREEN">is molting</span> to the title. Since Moire_eel gave such a great explanation, I am moving a copy of this post to the library.