Are you aware that they play dead very convincingly sometimes when startled? I've known people who have removed the body from a cage to dispose of it only to find that when they came back to get rid of it it was gone!
Any time I had them I kept the temperature in the mid 70's F but provided a small area where they could warm up more if they wanted to. I also used UVB lights on the cage but my cages were taller than the normal 20 gallon ones. I dusted with calcium the same as I did for veileds...at almost every feeding lightly.
They are awesome little critters!