I have kept quit a few different types. Oddly the only one I had issues fighting with other Triggers was my Sargassum, fought incessantly with my Niger, and the female Crosshatch. No guarantees with Triggers, but in general, different genus do fine together. I probably shouldn't have mixed Sargassum and Crosshatch, but couldn't resist, I'm almost certain my Sargassum was female, thus fought with female Hatch, and never with the male.