I have a colony of wild type endlers that were certified as class Ns. They came from a 1999 collection at Laguna de Los Patos by Armando Pou. They are not first generation but had their numbers increased as part of a SMP program by ELBAA. These fish are always ready to increase their numbers but need a diverse group to avoid too much "founder's effect" where the gene pool is too small. I decided, at one point , to separate a single male that I really liked with a few virgin, very young, females. What I ended up with is some very healthy fish that all look very much alike although the original colony has maintained a nice diverse look to it. It really depends what you like but if it were me, I would intentionally choose fish that do not all look alike just to keep things interesting. Class P fish hold absolutely no interest for me but I have seen some gorgeous class Ks bred by people like Adrian Hernandez at Swampriveraquatics.