my advise is dnt over buy if your introducin new food.
due to threads on here i changed sheldon from felix to high life and he wudnt eat it he ended up goin without food for a full day. so i ended up waistin a full pack. i then changed to natures menu which got the same reaction.
so i have opped back to felix and to substitute the lack of meat im givin him raw few times a week

good luck