Real quick this is my first bator hatch and I think my last. Day 18: I got 1 healthy chick, day 19: got 2 healthy 4 with rough navels, day 20: 5 healthy 2 with rough navels, today day 21 one pipped then died. I have 15 more in the bator and I have heard nothing or seen nothing. What in the crap is going on and what do I need to do.