Hello, and to BP.net...

Normal humidity should be around 50%-55% or so. For shedding, it should be around 60%-70%.

As far as how to control it will depend on what type of enclosure you are using and things like how big is your water bowl and where is it located? What are you using to measure the humidity and temps? And what are you using for heat and to control it? And what are you using for substrate?

If you can describe as much about your set-up as possible and/or post some photos of it, that would help. Also, where do you live?...