I'm almost done with my Ackie cage. It is 4x2x2. I have a glass front, solid top with Mesh holes, the size of the lamps, and small vents on the sides. Half of the bottom is solid wood, which I plan to cover with cypress mulch, the other half goes down 24 inches, and will be filled with substrate to burrow in. Is that enough deep stuff for them to dig in, and also should I stick with 2, or will 3 Ackies be able to live in the cage. I appreciate any feedback. Thanks.