I am in the process of switching my chicks from starter to layer feed. When visiting the local tsc I noticed there are several options when making this switch. Crumble vs pellet, organic vs non, regular feed with oyster shell on side vs layena. This was bit of a suprise with all the options. I purchased a bag of layena pellets with the oyster shell mixed in but am unsure if this is the best solution. Any advice?