Of all the BI's the Tarahumara would be fine in a 40-breeder because of their natural environment. They're from the hills of Mexico where it's cooler and dryer and they've adapted to live in that environment. So, they'd be more forgiving of the challenges of keeping any other tropical snake in one.
Same with the Savu, they're comfortable in a wider temperature and humidity range because they adapted to use the whole island of Sawu, which is only 60 square miles.
You'll notice that no one suggested a BRB male because while the tank is big enough for them, you'll never keep the humidity over 70% consistently, which is what BRB's need.
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