They do fine in racks as long as their requirements are met.
I have never heard of special lighting for BRBs. They are nocturnal. A 32 qt. tub will last 9-10 months or so dependant on the growth rate. 32 qt tubs are too small for any adult BRB in my opinion, but I am sure you could cram a small male into one of you want to.
One male can go with more than one female. Depends more on what you want to do then the snakes.
Just not as common.....ha ha....I think it is more about demand. More people like Brazilians...they are the prettiest![]()