I'm no expert. I used the no substrate method. I used Hatchrite,I added a lot of water.Not enough to make it soupy...maybe a cup or so.Put the light grate on the hatchrite. I had one small hole in the 6qt tub for the thermostat probe. I covered the tub with press and seal. Snapped the lid on over that. Incubation temp was 89f.If I had to guess, I would say the humidity was at or near 100%,
I had water droplets from day one. I opened the tub once a week for the first 4 weeks,just for a quick peek to exchange air. then every 5 days after that. All the eggs hatched.