About two or three weeks ago, I received 4 baby chicks for my birthday. They are two different breeds. They used to snuggle together and forage the little cage. They were only one or two weeks, and now theyre four weeks. Now, the partridge welsummers are separated from the black sex links. They'll both sleep in different sides of the cage, they wont eat unless the other breed is finished, and they'll fight with the other breeds so bad that feathers will be torn out and sometimes blood will appear. What's going on? They used to be friends. Please help my family!