All mouthbrooders can cross breed, that's why it's best to pick species where the females look different.
Gotcha. Is there any way to stock it so i can get some breeding going on but no crossbreeds? Like put some males and females of just 1 species, and the rest males then? I want this tank to be a show tank mostly, so not a species one, but could i breed 1 or 2 species?