Many will tell you too large a cage will stress out a baby....I believe that's wrong, what will stress out a baby is not finding a suitable hide. The hides need to be small enough so the baby feels the sides and feels secure inside. That said, since I have so many, I do have various sized cages for them, more to save space then to give a smaller cage.
An adult BRB will need a minimum of 4 square feet of floor space, better would be 6 square feet.
Thermostats are really handy to control the temps, with them the changes in the seasons (snake room temps) are compensated for. I use Helix 1000,s and am happy with them. If you have several similar cages with similar heat sources, one thermostat can be used to control all of them. I recommend a temp gun to check temps, very handy and a lot of fun to play with.
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Thanks,
Dave Colling

www.rainbows-r-us-reptiles.com
0.1 Wife (WC)
0.2 kids (CBB)
LOL, to many snakes to list, last count:
10.22 BRB
10.15 BCI
And those are only the breeders 
lots.lots.lots feeder mice and rats 