I don't think the blues from blacks ( Blue Diamond) ever do breed 100% true . I have had blacks for quite a few years and kept putting anything not black or chocolate into a pond outside- I put a few Rilis out there too but very few of them are still breeding true- over ther last year or so I noticed beautiful blues of varying colours so earlier this year brought some back into my tanks. So far I have had many shades of blue, blacks, chocolates and Bloody Mary. I have kept the best of the blues and put the different shades of blue into different tanks - I think I will end up keeping the lighter blues - I now have about 200 inside and hope the next generation will start to give me a more stable colour but I'm not really expecting a lot. S