I don't do anything special for humidity and mine seem to be doing fine. Our indoor humidity is usually somewhere in the 40-60% range, depending on the season. I reckon you can bump that up a wee bit, considering they're kept in a box with a big bowl of water. I'm a fan of air exchange/flow so tend to start out with greater ventilation in exchange for less humidity. If an animal is showing signs of needing more - dehydration or bad sheds - then I'll work on raising the levels a bit.
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