Pink tongued skinks don't seem to have any special humidity requirements and an adult would be perfectly happy in a 30 gallon aquarium if you set it up right. I feed my adults 2-3 times per week and mist once per week. The misting is more to make sure everyone is drinking/hydrated than to boost the ambient humidity - I've never had shedding issues. I also seldom handle but when I do, they're pretty darn chill. Being semi-arboreal, they're a lot more comfortable with being held off the ground than more terrestrial critters.
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