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As to the pine bark nuggets or chips.......mine are flat round smooth pieces of pine bark. If this is what you mean, I would not put it in the pen. It is too difficult to spot the poop in it and also you wind up scooping up a lot of the chips with the poop. I had it under my trees...
It's the color they are afraid of.
I have sand in my dust bathing box, and when I first set it up I had the fine play sand. The white color scared them off and they did not wanted to touch it, so I change it with leveling sand. It has more red in it and more stones. They are not afraid...