i have a 20 gallon glass tank with screen lid i have the heat lamp on the hot side with the uth and a wooden hide over the uth temp maintains at 90f water bowl is next to the warm side hide. on the cold side i have just a hide cold side maintains at 75f. in the middle i have a climbing branch. 3/4 of the screen is covered with tin foil i mist and reach 70% humidity and 2 hours later im back at 20% please help