HCA: Hermit Crab Association

I just got my crabs about a month ago and then I found this site. I have 4 crabs in a 10 gallon tank. Freddie, sunshine, shellbee, and D.j.

Thank you for your help

I have a 10 gallon tank with sand and coco fiber. There is about 4 inches of substrate in it

I really don't have any idea on when you know when your crab is about to molt and if you need an IOS tank. If you do what do you put in it

I'm new to hermit crabs and everything, and I really need help with molting. Could someone please help? I have had my hermit crabs for about a month now.