After reading that thread on substrates here is my plan for incubation:

-1 Cooler with an underwater heater hooked up to a helix
-2 small bricks and a diffuser

My question is do i put my eggs directly on top of the diffuser or
do i put them in a 6 qt egg box with unmixed perlite and 1 hole on the 4 corners with press n seal on top ?

Any feed back is greatly appreciated