Blood red fire shrimp question

Hi all,

I am still thoroughly enjoying my shrimp. I did get a panic feeling in my
stomach yesterday when I went to the tank and I thought something ate him.
I found his skin and his feeler thingies on top of a rock, but then I saw
him still in his regular barnacle shell hiding place. I guess he was
molting. Is there a site where I can learn more about this process, such as
how often they do it, why it happens, etc? Also, I didn't know that they
lost their feeler thingies also. Weird.

Sarah