So one of my lockdown eggs had developed a crack. It's not in a pip area. It's just below mid line...goes around half the egg. A small chunk of shell also fell off and I can see black feathers no beak ( w the flashlight while in the bator) through the white membrane. I went ahead and put a small piece of damp paper towel over the chunk. What if anything should I do? Btw it's day 21.