The chick starter or an all flock feed with 20% protein is just fine to use, as long as you make crushed oyster shell in a separate container available for those laying eggs. This is very easy when you have roosters and chicks or pullets too young to lay. But the layer feed is fine when you just have layers. My roosters did okay on layer with the extra calcium, but I would switch to all flock feed about half of the time.