Hi, my name is Jill. I know very little about hermit crabs, I bought one while on a trip to Petsmart for my other animals. My daughters begged me for one, so I went ahead with it. The lady I bought the crab from knew very little, although she encouraged me to buy the largest habitat. She advised me to use sand and told me to mist the tank once per day for humidity. So, I did some research online and found that I got bad information. I discovered humidity requirements, diet requirements, etc. I went to another petsmart location and mentioned my concerns to them. They told me to use reptile soil to keep up the humidity in the tank. So, I bought soil, oh, and I bought a second crab. I put three larger shells in the tank as well (I already had one, but it was probably too large). Here is what I really need to know, please help!! 1) Is it safe to use soil? If I use sand, then how do I keep up the humidity in the tank? 2) Do I really need a light? The crabs sit in a well-lit room (natural light), is this enough, or should I get a light? 3) They told me at Petsmart that a salt water dish was not necessary, although I've read it is. 4) Most important: The new crab is smaller. I just found him missing the top portion of his claw. I found it in the tank. What the heck is going on??? Is he going to be okay? Thanks in advance!!