I have had good results mixing coco-fiber and sand- it seems to "pack" a little bit better than just plain sand. I don't think that sand on its own really gives good traction. No one substrate is perfect, and what works in one situation may not work in another. For the moment, my choice of substrate is basically large flatish rocks (slate) and large aquarium gravel (like 1/2" pieces of rocks) over a base of sand and coco fiber (maybe 1/2 and 1/2?). Once a week I vaccum the feces and uneaten food with a dirt devil. If your main concern is the sand getting on the floor, why not try just use slate and tile as a substrate?

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