That's what kind I use.
I just take a clump and put it just inside the door to the hide. This makes the hide even darker and I believe adds to the security.
I have never worried about the humidity within the hide getting to high but for the whole cage you do not want to get condensation on the walls or roof. If you get that back off or add a bit of ventilation of air circulation.
In my PVC cages I can have this problem and all I did was add a small fan to the room to keep the air moving. It is not pointed at any of the cages and instead pointed toward a corner. This gets enough air moving to keep the cages on point.
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