Hi,
Gecko toes are not "sticky" like fly paper. But are composed of ultra fine filaments on the toe pads. These filaments are so fine that they can find the texture on a pane of glass, and therefore allow the gecko to climb it. Substrate will not stick to their toes. Besides, geckos can and do lick their toes occasionally to keep them clean. The only issue I could see with bark as a substrate is giving the crickets a place to hide. This could be problematic with such a secretive species like Bibrons. I know there are some who would advise against the use of sand due to impaction issues, but that is what I would use. Sand and lots of rock and clay hiding areas, and a full spectrum heat lamp on a timer.
As for a larger cage, I'm not sure if it would help you see it more often. But assuming you are using glass aquaria I wouldn't go larger than a 33 gallon, or smaller than a 10 gallon.
Good luck,
Jason
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