I only use reptibark, cause I have an aquarium with a screen lid and humidity has been tough to keep up. I found that the reptibark holds humidity well when misted a few times a day. I recommend fir bark, its been working fine for me so far. Sheds have been in one piece and none is getting stuck.

When it gets old and dry it will get dusty. Also, when I clean the cage I will reuse the substrate once before replacing with new substrate. I put it all in a bucket and rinse the chips really good with hot water, put in a colander and let drip dry for a lil while before covering the bottom of the tank.