I'm using press and seal this year, this is my first year breeding and a big year at that, I've had almost 100 eggs laid this year. So far I've had 32 hatchlings come out, I'll have a bunch more hatchlings this month (July). I use the press and seal the whole time, I don't burp and leave it on even when I have hatchlings in there, no problems at all. They seem to have plenty of oxygen, I've had zero issues as far as I can tell. I've been leaving them in the incubator for 60 days then cutting open the eggs to see what I have. Then I put the cut eggs back in the container with fresh press and seal until they all come out of the egg, usually 2-3 more days.
When I put the cut eggs back in the box I add plastic grating on my vermiculite to keep the hatchlings from getting full of vermiculite, prior to that I put the eggs right on the vermiculate slightly down in the substrate, just enough to keep the eggs from rolling around. I also put some damp sphagnum moss in there when I add the grating to keep them even more humid so their first shed stays moist on their body, otherwise it seems that they dry out too much. I've been using 200 mg vermiculite and 200 mg water mixed together in a plastic 'shoe box'. I put on the press and seal and put the lid back on. I thought they would run out of air too but I've seen other breeders keep it on the whole time with no issues as well, seems to be working just fine.
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