Sorry to drag up my old thread here, but I've been doing some digging. I don't think mine are Bismarcks, the ones I see online seem to have really dark faces but I can't seem to find any pics of juvie Bismarcks either, so maybe that happens with age.
I have found pics of Burundi juvies and I think they look just like what I have here... The LFS had them marked simply as "Frontosas" and could not tell me what variety.
So, my final question... Does it really matter? Is there any real great difference I need to know about? I do NOT want to breed these fish, that is not my intention, but I understand they will likely breed in a 135g eventually if they're happy. If that happens, I'll be happy to cull if these guys are some kinda "mutt" strain or something.
Any additional help would be appreciated!