Many calyptratus can live with 55% humidity but are they THRIVING under that condition?
Anyways, I'm working with montane chameleons, not calyptratus, so mimicking their "natural, actual" environment is of utmost priority for me and 55% ain't it. No skin problems, no URI here. Airflow is also key... but that's another story for another time.
Cheers!
t