I put 77 eggs in an incubator that only holds 50. I stacked them, but it was not heating evenly. I ended up pulling about 15 clears and 5 quitters. Now I have one layer of eggs and the temps are constant. Then the power went out. I'll know in a couple of days if the hatch is successful. My incubator is cheap, so that is probably an issue, but I think I need to resist temptation next time and only put one layer of eggs in there!