I read to change from the starter feed at 8 weeks but to what? I just searched the posts and read that they shouldn't have layer pellets until 20 weeks or so? Do you mix starter feed with the new kind to slowly transition them or just change it and make sure to take out all other food sources so they are made to eat the new food? I am asking because I switched my 8 week old chicks to layer pellets cold turkey and they aren't really eating them and now the roo has diarrhea. He's the only one I noticed so far!