Mine are peaceful, but they can be nasty. Just like any Cichlid. Ive had Jags that were great tank mates, others have had them be killers. A friend of mine got rid of his female cause she put a whoopin on everything. I have a 12" female that is the perfect tank mate. I have a video also in the media section, check it out there. If you cant find it, scroll through my posts.