Successful flock integration! Feed question

[My Three Chicks]

So I'm nearing the end of a long integration of my 2 small flocks...yey! They've been in look-no touch, then look-limited touch for about 5 weeks. It's gone great!

Now I'm almost ready to fully mix them full-time but want to be sure I get their feed correct!

My original 3 hens are 2 years old eating Layer feed. With oyster shells and baked eggshells available all the time for extra calcium.

My 3 12-week olds are on a Grower feed they are supposed to continue to 20 weeks.

I believe I'm supposed to remove the Layer feed now and everyone eats Grower feed, correct?

 

[AidKD]

Honestly, I never gave my last round of chicks grower feed. Everyone of all ages (ranging from 3 days old, 4 weeks, 1 year, to 2 years) have all been on layer feed and they've all done very well.

 

[rosemarythyme]

Have them all on grower until some of the littles start laying, or until the recommended age on the bag, whichever. Any damage from the excess calcium may not show up for years,