I'm still new to the ray hobby and I have a problem. I currently have 2 female black diamonds around 8 inches and 1 male hybrid King I was told was a King henelai/black diamond who is around 10 inches. My problem is one of the females is a bitter. I really don't want to separate any if I don't have to. No serious damage but she does leave light marks on the other two. I feed them 3-4 times a day. Any Advice???