i started incubating some duck eggs. i candled them at day 7 and amazingly i have 15 alive and moving. but i noticed one of the eggs has about an inch long crack in it. it doesnt have anything leaking and i can see the embryo moving around. so i cleaned out an egg carton and put the eggs in to protect them from anymore cracking. but they are sitting upright and ive been very carefully just tilting the whole incubator from side to side using a box underneath to prop it. but im worried im not angling them enough from side to side. so my question is if im incubating the eggs upright instead of on their side how far do i have to angle them? i dont want them to fall over so i dont want to chance pushing it to far on its side. how much angle is nessecarry??!!