You don't want to breed a mixed varient fish. Notice the stripe across the eye of the bigger kigoma.. that's what they should all look like. It's always possible when buying from a fish store that they are mixed or bad quality burundis. If you're interested in having a colony and breeding, go online and buy from a reputable breeder. It'll probably be cheaper than buying from a lfs and you'll have nicer quality fish. A great resource for fronts and varient information is cyphos.com.