some of my Leopard-Guppys carrys autosomal dominant "Elongated" Gene ( cf. Yoshiki Tsutsui) similar (same as) to some speartails. Homozygous males are unfertile look at the gonopodium:
Happily I got enough "non elongated Leopards" ; o )
additional to my guppystrains, I am working with some Xiphophorus maculatus. Here is a picture of a orange albino youngster. It is a long way to get Fullred-Corals!