Can humidity be too high?

[Sasha2]

Ive had my rainbow for 2 weeks now. He was given to me along with a ball python. He is about a year old, best guess. Now he had a bad stuck shed but Ive have gotten all but one eye cap off so I wasnt worried to much about the super high humidity. But long term could be a problem. I bought a digital hygrometer 2 days ago and it reads 99 percent. Is this something to worry about??
He is in a tub so I imagine the only way to control it is too put in more holes?
Papertowel substrate, two hides with eco earth in them. A large water bowl.
The ambient temps have been a bit too cool. I just moved to the new house so havent gotten things squared away yet.