IMO, if you are going to switch your beetles to a new drawer every week or two then 2 inches of substrate is overkill. I put just enough to thoroughly cover the bottom.
I have read this thread and will add my experience breeding supers even though I have only been doing it since early June.
Posted on the first page "500 eggs in a lifetime - of which around 50 will hatch". There is no way this is true from my experience.
I tried switching every 2 weeks and...