I personally think anything below 50% is too low. I prefer my normal humidity to be between 60-70% and in shed to be more. I have never had an RI ever. If your air is stagnant and enclosure is dirty, yes it could promote bacteria growth. But I have good air circulation and clean my enclosures every time they are soiled.
If you look at a BP's natural range, the humidity in Africa is pretty high.
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