Veggies: Organic Spring Mix. I remove the spinach from that because I read somewhere that spinach is not good for them. Something about it binding calcium and being toxic. You'll want to also provide them hardy greens like Bok Choy and Kale. Do not give them a bowl of water or straight water to drink from. No need for
bath's or misting. They are desert creatures, from very very dry parts, and their bodies cannot handle any more water that is found inside the veggies. My Uro's expel a lot of water when they poop. For the babies I tear up the veggies with my fingers until the pieces are about the size of a dime. Sprinkle this into a veggie bowl or just straight onto the floor preferably near the cool area as they will shrivel and dry in no time.
uvb needed ? You can buy the Repashy vitamins and calcium packets from Deer Dern Farms and that will supplement the
UVB bulb. Right now I have a reptisun 10.0 bulb in my Uro Viv that I occasionally turn on. I just feel nervous not giving them
UVB light because they come from a very hot, bright, dry climate where there are sun rays everywhere. But you can certainly provide the Repashy supplements and they'll do fine without the bulb, according to Deer Dern Farms.
size of tank? Atleast a 40g to start. Give them a cave on the hot end (100-110 F approx.) and a cave on the cool end (80-90 F) Make sure you have that gradient of heat so that they can cool off when they need to. Buy the digital probe thermometer for that. They need caves to feel safe. It's better to have caves that just come up to their backs because that is what they are used to in the wild (they dig their own caves). For the basking platform I prefer natural things (not plastic stuff from the store), and I use a piece of driftwood.
cohabitation? If you want to pair Uro's, do it while they are very young. There is more info. on this at Deer Dern Farms.
I have no experience with adult Uro's yet, but they are supposed to be a bit more independent and shy from what I've heard. Mine don't like to be looked at while they eat. They get nervous and go hide. I've heard of some that don't like to be held no matter what you do. So in general they like to be left alone. My female has no problem being held and voluntarily walks on my hand. My male is the opposite and seems nervous or timid with any interaction.
This is just from my experience with 6" baby Uro's and the behavior stuff might change as they get older. DDF has much more experience with Uro's than I, as they have been raising them for many years and know all about the different varieties of Uro's.