Wife got tired of the mess and waste with the Flock Raiser crumbles, so brought home 2 bags of Layena pellets. We have two flocks, the older (Gurlz) were hatched mid-May (so they are about 16-17 weeks) and the younger (Kidz) on 6/18 (so about 12 weeks). All are dual-purpose heavy breeds. What is the risk of kidney damage to these birds if we put them on a straight Layena diet? Should we go back for more Flockraiser?