So, I have eight rats in my cage. One of them, Picasso, is getting pretty chubby as of late, because the boys give her food and let her eat first because she's their mother. I want to get her to lose weight but how can I do that when she's one of many? I thought about seperating her for meal time but there will probably be left over food in the cage when I put her back, and while taking it away at earlier meals would be ok, I don't want to do that at supper time because it tides them over for the night! What to do?