I have 17 week old Golden Buffs and got my first egg Saturday. I also have 11 week old Black Australorps. They all share the same coop and run. I know that the Golden Buffs should be switched to layer food and I should put out calcium free choice. However, what about my 11 week olds? I can't separate them due to housing limitations. I can put out two different feeders, but have no control over who eats what. Any suggestions?