I've seen "substrateless" refer to two different ways of incubating. The first is where the egg tub has vermiculite and water mixed in the bottom, with light diffuser on top of it and the eggs on that. The eggs never touch the vermiculte substrate, hence the name. The other method is where there is no vermiculite, just pieces of PVC or something else to hold the light diffuser up out of the water in the bottom of the tub. Often there's something like plastic canvas mesh (available at craft stores) on top of the light diffuser to prevent the hatchlings from getting into the water.
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