Have you ever allowed your BPs to maternally incubate their eggs Heather? What is the ambient humidity in the tub during this, before they control the humidity? <----did that make sense?
Yes I have.
Ambient humidity was around 60%, and she used it well.
Papertowels on the tub floor, water dish full of water, and that was it.
I have heard, yet did not see, that if the humidity is too low, they will urinate in the coils to keep the humidity up.