I house all of my hatchlings in 3 gallon rubbermaid or sterlite tubs in a rack. The temps on the warm end are approximately 83 degrees. One thing I have noticed is chondros do not like higher temps. Use the same temps for adults also. As for humidity, you want the cage to have a good amount of humidity each day, but you also want it to dry out over night. I try and spray all of my cages each day. Sometimes I let it go two days if I spray too much and the cage doesn't dry out as soon as I would like it to. Just remember, just because your cage is wet doesn't mean there is high humidity. The best way to know you have good humidity in there is if the front of the tub or cage gets a nice film of moisture after spraying. I would say for approximate numbers, you are looking at 40-50% when the cage has dried out, or lower depending on your location, and then with spraying it should jump to around 80%.
As for purchasing a gtp, please buy from a U.S. "breeder". It will make your life so much easier when it comes time to trying to feed your new snake. There are a lot of people on the classifieds here that will say its captive born and raised, but in all reality they are farm hatched and then shipped into the U.S. Always ask for pictures of the parents, if they can't or won't provide that then you know they are farm hatched. Farm hatched are not always bad, but there is an added risk involved such as possible parasites and the added stress of multiple shipping. I wouldn't buy any farm hatched unless it was from Bushmaster stock. Even then I would be very hesitant to buy one. Also you have no idea how many meals have been put into it over its life time. A good chondro breeder will not let any snake out of their facility until 10 or more meals are in the snake. I don't ship until I have 20 meals into them. I make sure that any snake from me eats when it arrives at its final destination. I am not trying to sound like an advertisement, besides I don't have any chondros available right now. I am just trying to give you the best information so you do not get screwed in the long run.
You might pay a tad bit more for a pure captive born and bred chondro. You will find farm hatched for around $250, while you could find a bunch of good captive bred stuff from a good breeder for not much more than that. Most will also provide a much better quality of after purchase service than the importers will. A list of breeders can be found over on the MVF forum under the classifieds section if you are having problems finding a breeder.
Hope that helps.
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Mike Bair
Chondro Dreams