I use the kitten forumla for both my kitties and my oldest is 10 months this month...sometime in June he will be 1 year old...when should I change him to adult food and also, how do I seperate the 2 foods so Fluffy doesn't eat his if he is eating his adult food...as for now, they eat the same food, and eat out of each others bowls too..does anyone else use this brand too? I have noticed alot of you use Natures Choice and Science Diet....