I kept a couple of A. diaboli (Gray Salamander) when I lived in North Dakota. They were once a subspecies of A. mavortium. I lived not too far from Devils Lake where there was a fairly large population of neotenic diaboli.
I was going to order marbled salamanders but simply to warm here. My house temps at night are 72 and during the day when at work it is 78 so not a good enviroment for them . Did you see the Gray salamanders much or hide 24/7?