Help not all eggs hatching!

[Momma*chicken]

The egg that hatched was an ISA Brown egg, but we have 2 roosters. One is an australorp and one is an Easter egger. So u guess I know who the father is!

 

[Momma*chicken]

As long as they are not too far apart, it should be fine.
Most I've had is two days apart. Wasn't ideal, but it was fine.
Enjoy your first hatch, it's a lovely experience.

Thanks!