re: hatching in egg cartons... i prefer the paper/cardboard ones, because they can soak up some water to help with humidity if needed. i also treat them as disposable. if they get icky i just throw them away. i don't cut the sides or anything, but use the 30-egg trays, and cut one to fill the gaps on the sides. so i have when humidity's a big issue, i just squirt some water into one of the 'holes' and fill it about halfway... no more humidity problems until it dries out. takes a while too. the only time i'll lay one over is if i notice it's pipped on the small end... then i'll lay it on the floor of the hatcher and keep an eye on it.