I use the light diffuser method as well, with Perlite. The only reason you use vermiculite or perlite is to keep the water from sloshing and touching the eggs. I've even seen some people use pebbles in the bottom. Sorry you lost the clutch. If you do a search on this forum for egg tubs, you will find many different ways to set them up. I think for the inexperienced, the diffuser is a good method because you don't have to worry about how wet or dry your medium is.
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