I can't answer all of your questions, but I can offer a little help from the few I had and the hundreds of imports I dealt with.
I don't know any breeders off the top of my head and all the ones in pet shops will be imports. The imports are pretty darn hardy, not picky eaters, no fighting. I would do a fecal on one and treat whatever parasites are present. They are VERY prone to nose rubs on the glass. You may need to black out about 5 inches tall of glass where it can be on the substrate and pace.
True babies are TINY, but I would put one in a 20 gallon long to allow a water area and a land area. If spooked, they can pick up and run. Blacking out the glass is beneficial again. I am not sure about growth rate.
That enclosure looks pretty good. I would increase the depth and slightly the length of the water area. They like to dive from the branches into the water when frightened. You are going to need an extremely good filtration system. You need to make it easy to drain the tank entirely, and it needs to be easily disinfected. These guys are very messy and love to poop in their water.
I hope that helped. I am by far an expert but just thought I would offer my experience with them.
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