Adding fans is going to kill your humidity. I experimented with this about a year ago. What I would recommend is adding more vents to your cage rather than using a forced air system.
It doest need to be fancy, just a 1/4" diameter drill bit. Put as many holes as you feel you need. If you really want to you can make a design out of them.
If you put some holes towards the top of one side, put some towards the bottom on the other side. This will use natural heat/air currents to your advantage to maximize airflow per hole.
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