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First of all males tend to be 2-3' on average. They stay smaller than the females who will more likely reach the 3-5'. So your boy may already be at this adult size.

Second of all, bps can be cannablistic. You won't find too many supporters of housing your snakes together here. One snake = one cage. Your temps seem a bit low too. You are just asking for a respiratory infection if you allow your temps to dip below 75. You should keep your temps as stable as possible. 92-94 hot side and 82-84 cool side.