Not really, it should be a third to a half of the wall so the animal can thermo-regulate, it should say this in the instruction manual. Just because the frogs are healthy doesn't say anything, I've seen these frogs house innapropriatly and do fine, they're hardy. No need to cover the screen top, especially with a heat mat. Humidity isn't such a concern with these frogs, they're from a place that will have dry seasons but ideally should kept moist to keep them active. With heat mats I mist 1-3 days and heat lamps every morning.