That's pretty high humidity for a WTF actually. I've read that they don't do well with "tropical" type humidity (like for Darts), and have always maintained my crew well at 50-60%, never higher than 70% (just after misting) and never lower than 45% at the bottom extreme. They always have full water dishes, and I use either reptile carpet, paper toweling or a bare bottom tank, no moss or other substrate.