I got the new crab last Friday evening. As soon as I got him home, I put him, in the little 3 gallon iso tank. He came in a cup with a little substrate in it from the store. Since this is a clean iso, I thought maybe I should put some of the store substrate in the iso tank, to generate some good bacteria?? The new guy ate, drank and went under about an inch so far. The reason I know this is becasue last night,. I moved the climbing coral and could see him slightly under the sub there. I could see his eyestalks move so I immediatley put the coral back. But, there is a dead smell in the tank when I open the lid to put in fresh food, smells just like a decayed, dead carcass smell.??(sorry to be so graphic, but that is the only way to describe the smell) I did see him move last night and could smell it last night too, what could this be?? Was thinking another hermie had died in the store/ substrate and I am smelling that???