I've seen a few pics of people's tank recently and they seem to have a mixture of red rilli and light blue coloured shrimp together. I'm assuming these guys don't necessarily breed true? If rilli's breed other colours do they still need to be separated, or can you then keep them all together? Or would they breed bad offspring? I've got a few shrimp tanks setup now and would love to learn more about breeding etc so I do the right thing ?