A pile of perlite is the same thing as substrateless incubation method. It wouldn't change things one bit if you put a light diffuser on top of the pile of perlite to insure the eggs didn't touch the water. The only thing the perlite does is to keep the eggs away from the water. Pile up the perlite and add water that doesn't reach the top of the pile. Plain water under the egg crate is all that is needed, the only thing accomplished by adding a medium under the egg crate is to keep the water from sloshing around on to the eggs when moving the box.

This debate is pointless though due to the fact that BP eggs are so easy to hatch. Almost any method would work. If we were discussing something that was more difficult to hatch, the incubation method matters much more. I haven't hatched any Chondros in many years, or even read anything about them lately, but the last time I checked, the SIM was the method of choice.

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