I second removing some of the plastic from the cage. I have some plastic that I put over my cages if the humidity drops. I usually use that for when it gets colder or hotter as the heat or air is on.

You could put plants in the cage and that is all up to you. I wouldn't and when I had mine I kept the tank to a minimum. You'll find that these guys will just bury themselves from time to time, and anything that gets in there way will get knocked over.