Hey, I had the same problem when I was trying to find info about these guys. I've been keeping them for about half a year now, and this is what I've experienced. They've both shed, eat like crazy, and are getting pretty plump, so I'm guessing that what I'm doing is working out for them.
>1. Whats a good temperature
I keep my guys with an ambient temperature of about 82 degrees. They like to burrow at the low end (which is usually 75 to 80 degrees, and I'm guess that it's probably cooler in their burrow. The warmer end I keep at about 88 to 90 degrees.
>2. How high should the Humdity be
I try to keep the humidity around 80 percent, but sometimes that's not too easy so I used cypress mulch and sphagnum moss which is constantly damp. Their burrow is always damp too. I keep patches of dry, but they don't seem to prefer it. I use one of those waterfalls with a mist creating device to up the humidity. They like to soak in the waterfall from time to time, and will drink directly from it too.
>3. Whats a good substrate
Cypress mulch and sphagnum moss is working out great for me. It's very easy for them to burrow in, and keeps the moisture level very high (even if the ambient humidity might only be like 60 percent).
>4. Do they need a basking lamp and what wattage if they do
I have one to simulate day light, which keeps the warm spot at around 90 degrees, but I've never seen them basking directly underneath it. I've seen the male outside sleeping in between the 82 and 90 degree sides of the tank, partially hidden in a cork hiding spot, so I'm guessing that they don't care for the light. I've seen them listed as diurnal animals, but I'm pretty sure they're nocturnal.
>5. Is a 20h ok for a pair or trio
For a pair it's definitely OK, and heard from the guy I got them from that, so long as you supply ample number of hiding spots, then a trio would be ok too for a 20 gallon long. Obviously don't house 2 males. I have a pair and they're happy sharing their burrow.
>6. What is a good varied diet
I give them gutloaded mealworms covered in calcium powder. I tried giving them crickets but they didn't seem very interested, although that may vary between individuals. They have a very interesting behavior where the male (it's the only one I've ever seen foraging) will go to the feeding dish, pick out a mealworm, and scurry back to the burrow. I don't know if it's taking it to the female (which would be amazing behavior, although unconfirmed) or what, but he does this pretty frequently. Also I see uneaten mealworms still alive in the burrow sometimes, so they may also hoard them (seeing how the dish is too deep for the mealworms to crawl out of them). He usually doesn't crunch them up right on the spot.
>7. What do they normally do
Hide and sleep. They're aren't the most active animals, but they're very cool anyway.
>8. What should in inside the tank
I have about 3-4 inches of substrate for burrowing (cypress and sphagnum) and two pieces of hollow cord for additional hiding spaces, although they just dig under it to hide. I also have a feeding dish, calcium dish, and the waterfall for humidity and water supply.
>9. Tell em about breeding
I really wish I could tell you more about this one, but unfortunately these guys haven't laid anything yet. Well, seeing how it's only been about half a year it's not unreasonable. I wish someone would give me some info on this particular aspect of their life cycle too, I'd be really interested in finding out.
Hope this helps. Good luck 