As long as you have an adequate amount of labs in the tank, I think you'll be fine. Labs tend to be one of the "schooling" Africans. They prefer to be in numbers, that's how they feel the most comfortable. Mine stick together. It's pretty cool to watch all 6 of them swim around the tank together almost like my Tetras in the community tank. Whenever adding species that tend to be more aggressive, make sure you have a nice grouping of the more docile specie.