hello, i have a mixed flock of 9 week old chicks.hens and roos and different breeds. all the chicks are from show line and are from really large (huge) roos and hens. i want these chicks to get as big as possable. what is the rite food to feed them? i had them on Kruse grower starter crumble. i dont like the mash. but all i could find is an organic bag which is really expensive. what else do i need to look for??