Just want to clear up the too-low vs too high issue with humidity.
Too low humidity is bad, anything under 40% is too low.
High humidity on it's own is fine. The parts of Africa that BP's come from have very high humidity practically year round, much higher than most people keep their cages. The issue with high humidity is that it is often achieved by drastically reducing air-flow in the cage, and can cause condensation on everything inside the cage. A cage that has low air flow and is damp all the time can grow some nasty stuff in it. That said as long as a cage has good airflow, and there isn't any condensation forming on the inner walls of the cage high humidity (above 60% RH) is fine.
Here is a chart showing the average low and high % humidity in Ghana (where BP's come from)
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