You can use PVC pipes cut to the right heights.For inside the egg tub, it sounds like substrateless/just straight water with an egg crate on top is fine. What do you use to raise up the egg crate higher out of the water so that air can circulate above and below the eggs?
While this method is used it can cause a lot of condensation in the tub, and you have to be very careful with water sloshing around.
It can cause issues if an hatchling egg sac or cord was to get caught in the light diffuser.Also, I read around that egg crate is dangerous for hatchlings to crawl around on. So how soon after the first egg pips can I move all the eggs onto just damp paper towel? What should the humidity be at after the first pip? Still 100%?
I simply prevent that by replacing everything with paper towel once they slit through.
Once they pip they no longer need humidity at 100%
You don't have to do anything regarding humidity in the egg box all you need is air out once a day or every other day when they pip for proper air flow.When do you take out all the hatchlings out of the egg tub and into a normal setup with holes in it, on a heat pad? After they all finish coming out, or just after the first pip? And... at what point in this whole process should I start to lower humidity from 100%?
As far as pulling hatchlings and setting them up different people different ways to do things, if I check and 1 or 2 are out I will put them in a tub and continue until none are left. But I have had clutches in the past staying in the egg box until everyone was out as well.