*new pacman frog owner, so help me out

I just got my pacman about 4-5 weeks ago, and I have some questions.

He is in a 10 gal tank with a mesh top, coconut substrate, Zoomed double heat lamp, one 60 watt day bulb, one 60 watt night bulb, a reasonably sized water bowl and I mist him quite frequently because I worry.

I mist him and get his ground reasonably moist, and I mist him too. The problem I am having is that his humidity quickly declines, as I type his humidity is in the 75-85 zone. Within an hour, it usually declines to about 65-70...

I really need help, any suggestions on keeping his humidity high, and his substrate moist?

I dont know if maybe A glass top would help?

I don't think you can buy glass tops seperately, and I am not used to buying things online... Any suggestions?


Please, please help me!