I have a tank with a drainage layer that I've been testing on some gulf coast toads, and honestly I kind of like it! With this kind of setup you can use much deeper substrate without being concerned about the lower layers going sour.
However I did use a more sturdy divider between the soil and drainage layers due to the fact that my toads are burrowers: an "egg crate" light diffuser cut to the size of the tank, double-wrapped in nylon window screen, with each edge braced with piece of well-aged brick. It drains really well and there has been very little soil loss. My fire skink tank has an almost identical design and the skinks and plants are quite happy. I honestly think a pacman would be fine in this kind of setup, particularly with a soil mix that could hold burrows better than coco fiber.





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