Hi Mike.
I have 2,2 U. Guentheri, and have kept this specie for 2 years. The specie comes from NW Madagascar, where the temperature is higher, than you usualy see in Mada. Therefor U.G. needs temps varying from 24-30 degrees Celsius (Sorry, Im from Europe) They need a 3 month period with a bit lower temps, where the humidity are lower as well, means about 60-70%, rest of the year 75-85%
The coolest temp registered in the area is 13, and the max 39, but this is offcause not anything you want to try!!! Keep the temp around 30 in the top and down to for example 24 in the bottom, and the animals will be, where they find it comfortable.
I keep mine in pairs in cages of 40x50x90 cm (sorry again) This works good.
I have had problems with rackitis. One of my female died because she kept laying eggs, even though she lacked calcium og perhaps another vitamin. Now I use the german "Korvimin ZVT" and Miner-All. This works better. 1 unit of Korvimin, 2 units of Miner-All every time you feed.
Pleas mail to me, if you need any other information. I can provide you with contacts to succesfull keepers, if neccessary.
Regards,
Kristian Poulsen, Denmark.