hermit crab molting, i think

Question
HI! I just got two hermit crabs less than a month ago. Both are a little less than the size of a golf ball, and one seems to be digging a lot. I tried to read up as much as i could on hermit crabs on the web, but i'm a little confused since different sites have different answers. The one that is a little bigger seems to be molting, i think, but i don't know what i should do for him. I have a fairly small tank, about a foot and a bit long, and i've only provided one bowl of water, but some sites say i should include a saltwater bowl, is that true? should i use sponges in the bowls? they don't seem to eat a lot, maybe about a spoonful of food a week. I'm worried about a molt. Do i need to seperate my two crabs? How long will the molting last? do they eat while molting? any other additional information would be greatly appreciated.

Answer
I separate mine when they molt. Yes give them saltwater it is essential for some species. Based on their size you don't need a sponge unless it is for humidity. That is the average amount of food they eat. My favorite site for hermit crab info is hermit-crabs.com
Sorry about the late response my computer crashed!
Katie