This strain is a cross between a Red Chest Endler male and a female guppy that carries the HB trait.
At the moment I try to establish a stable strain out of the best males. This is not easy due to the quality of the double sword tails. They vary extreme in F2 and F3. Hopefully this will get better in the next generations. Another problem is the black colour in the back half of the body. This seems to bleach out in old males or when the fish are under stress.
Still a lot of work to be done on this strain - but a young male in it's prime is a stunning view and worth the effort!