Help! Really concerned about our baby rosy boa

[krstn]

Temps on the hot side between 89 and 91 degrees, regulated by a thermostat ( using heat pad on underside of tank). Cool side I use a reptile heat bull (the red kind) and temp there is between 78 and 85, using a digital temp/humidity gauge to monitor. Humidity is under 30 percent unless I leave the water in, in which case it goes up to about 36 percent. Is the care fresh unhealthy for her? I have a big bag of it, but will switch if it's better for her health.