I found this to be quite a helpful caresheet when I started looking into getting this species:
http://www.sundialreptile.com/caresheet-chondro.htm
My vivarium is 24"x15"x15". I use playsand and a slightly coarser grade of sand mixed together. It's kind of a generic 'reptile sand' that I bought for my aquarium initially because it has a nice natural colour.
They do like a lot of sand too for digging, so a fairly deep layer of 4 or more inches will be appreciated. Mine seems to like it quite warm, but he also utilises the cooler hiding areas in the tank. Around 35C in the warmest hide, but warmer just beneath the bulb, though he doesn't tend to bother going 'up top' in the day time so he never experiences it any warmer than that. I'm not sure about housing singly or in pairs as I have only the one animal. There are other keepers here who can help you out on that score.
Mine has a voracious appetite and will snap up more or less any insect I offer with his suprisingly strong jaws! I wouldn't want to get my fingers too close to my male Chondro! You can see the jaw muscles moving when they chew... all insects seem to be effortlessly munched down. Mine tends to favour locusts and mealworms over crickets, though he will still eat crickets only with less tail buzzing.
I hope that helps a little... I've not kept this species for long, only a few months.