Actually your suposse to moist and then let your animal skin and cage dry out, otherwise they will endup with skin blisters and respiratory problems. In the wild green igs and water dragons alike go between areas of very low humity to areas full of humity as they climb to the top of the trees and back into shadow areas full of vegetation. And having allot of envoiroment moist will do litle to your animal body if for example he doesant drink allot of water. In your case having a water basin and plus the ocasional moist supplies every water needs of your ig regardless of the envoiromental moist.