Ummm.. I've been reading that hermit crabs need salt water but am not sure what the ratio should be. Does anyone know?

Also, what is a "good" diet for them? I have commercial food, but How much of that should I give and should I supplement it with other foods? If so, What?

If you could answer these questions, that would be great. I'm going to try and get a book on them soon......

Thanks