How is this best accomplished? Take a blue male or female, breed w/ regular jack dempsey, raise the fry and pair them again w/ their blue parents for 50% or sibling fry for 25% blue return? Is a male or female blue carrying regular jack more important? How does one determine which fry to select for breeding back w/ the orignal blue recessive strain? Can anybody help explain this or do I simply have to breed and have genetic testing done afterwards to be sure? 
