i prefer using eco-earth or bed-a-beast for any geckos that are more than a couple months old ( over 6-8 grams) i like the humidity rentention, and i think it is easier to clean by scooping poop rather than removing everything in the cage to change paper towels.
here are a few photos of racks that i made.
i like them because they have very good visibility along the whole top of the bins, and they air out better than similar designs
here's the 20 qt. one that i keep single adults in

there's room for 3 more bins on the bottom, they're just not in the photo

here's the same design but for small kritter keepers


i don't have a full front shot of the smaller one at the moment. if you have any questions about it let me know

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