My new fire salamander, questions

Hey, some of you may know I was working on and trying to find a breeder or somoene to sell a fire salamander. I finally found one and it arrived last week. He seems to like his new home. He hides alot though, until i put some crickets in there for him then his head pops up and he comes crawlin out and starts hunting..and he keeps hunting until he gets it. I love watching him, he seems pretty mellow. Please let me know what you think of him (does he seem normal and healthy?) and his set-up and if i should change or improve it. the substrate is a 50/50 mix of topsoil and eco earth, and a bottom 2" thick layer of pea gravel. I have some frozen water bottles ontop wrapped in a towel to keep the tank cool..about 66 degrees F. Also does anyone know what subspecies he his? its first my first time taking care of a salamander, but I want another ANY thoughts and input is appreciated. thanks guys.

You may or may not have already seen this article, but it is a good starting point for his care:

Caudata Culture Species Entry - Salamandra salamandra - Fire Salamander

thanks, I did check out that article. nice information there, and on this site. I was just wanting to see what you guys think about him and my set up.