im using vermiculite too, I use a fine grade. I fill the tub half way with vermiculite. I add water, just enough for it to clump up when you squeeze it. But not so wet it drips when you squeeze it. I separate my eggs. I dont leave them all together. I put the eggs in the vermiculite so that half the egg is covered by the vermiculite. Most of the time I will cover the eggs with vermiculite. Then use a clean dry paint brush to clear of the extra vermiculite.
I then put a sheet of press and seal over the tub. Then I put the lid on.. I vent them about once ever two weeks or so.. After day 40 I will start venting once a week. At day 55, I will peal back 1/4 of the press and seal. And put the lid back on. Its normal for them to dimple some a week or two before hatching. They dont always do that, but sometimes they do.
If they are dimpling 20,30,40 days in. Your humidity may be to low. I normally cut my eggs on day 55. Once I cut I will take the press and seal all the way off.
Doing it this way, I have not lost an egg in 5 years, from incubation issues. I have lost eggs that were kicked out. Eggs that were weak to begin with. But not heat or humidity issues.
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