I've seen it done both ways - substrate and the rack. I like a 6qt tub with hatchrite, the cling wrap over the top, then snap the lid on and pop in incubator at 89 and 100% humidity. Then, I just "burp" the tub every 3 or 4 days, which just basically means opening the lid of the tub and recycling the air. Seems to be the winning method for me, but good luck to you. There's also a sticky on setting up an egg laying tub that's pretty good.
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