The thing with 'hoping' that he'll find a female saulosi is just that, hoping. Even if you have numerous females in the tank with him, the simple matter is that he is still a male, and being dominant ( I would assume), he'll breed with whatever females are around, unless you find a male lab that becomes dominant or strong enough to compete. I would think that just about anything would cross under the right circumstances, just look at the Aulonocara/Mbuna hybrid in the ob peacock. People must be aware of the easy possibility of hybridization in fish when kept in tanks together and stop keeping fish that will so readily interbreed together. Even with Haps and peacocks, I'd never keep two species from the same genus together just in case there were the chance of mixing. Unless you're there and watching every single spawn you can't guarantee a purebred fish.