In general for all animals, and from the experience of my frogs, take a while to get settled in a new environment.
Stress will go down with good husbandry and keeping activity around his tank to a minimum.
In fact it shows proper response in the animal to be cautious in a new space.
My first WTF took about a month or two to feel comfortable and racked up many hours in his hiding spot- now I almost never see him hiding
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