It may be a reciprocal cross. It seems from my research and experience that crossing a male BG with a female GSF generally produces a different looking fish than crossing a female BG with a male GSF.
Cecil, I see that all the time and not just with HBG. People think that just because it is a hybrid it must be sterile. Some crosses that is the case, particularly those from more distantly related species. But crosses of species that are more closely related are often fertile. In general, it seems far more hybrids are fertile than infertile in the fish world.
