I don't have an ARS rack but I do have the Animal Plastics Hatchling rack. 9 levels, 3 boxes per level. Every box slides in and out smooth and has a small gap. Even the tiniest red milk hatchlings don't get out. The fit is so perfect that I had to drill holes in the shoeboxes to control the humidity. I started with just 4 small holes and added until I got the right amount of humidity without losing too much heat. 8 small holes per box worked perfect for ball hatchlings. I highly recommend the racks from AP.

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