Day 23 - no pips

[SoggyForks]

I've hatched 3/9 of my chicks and they've been healthy. But the other six eggs haven't even pipped. Three of them are dark (black copper maran) and two of the other three look well developed. My most recent hatch was yesterday (day 22). Should I be getting scared? When should I step in?
I candled them and spotted one that's definitely still moving (I think trying to pip internally - lots of wiggling in the air sac. Should I assist?)

 

[nuthatched]

Leave it alone for now.

 

[HollowOfWisps]

Agreed give it until day 25 especially if you don’t have a lot of experience incubating eggs.