Everything I had looked up on these guys when I bought mine contradicted each other. I do keep mine around the mid-70's, and try to keep him very humid, misting him a few times a day. I don't think the temperature drops 10 degrees at night, but it is definitely a few degrees cooler.
For mine, I use the tropical soil you find at petstores, with moss on top, and then leaves on top of that (I get my dried leaves at saurian.net, but I'm sure a lot of online reptile shops would have them. I like them). I also make it as full as possible...I have fake ferns and lots of leafy vines, so he can stay well hidden. He seems to be doing very well. I've had him since October.
But Tom can probably give more info than I can.