O's are often big babys. I think you'd have a better chance with a GT then an O but honestly a Jag needs to be by itself if it's in a tank smaller then 125 or so. If your determined to keep a Jag with other cichlids you should look at around 4 or more RD/Midas, Odo, Trimac and other fish that are aggressive and grow to 14"+ and buy a tank that's at least 6' long.
When it comes to large, aggressive cichlids, you either keep them by themselves or use the "controlled chaos" theory and overcrowd the tank so territories don't get established which reduces aggression.
When it comes to large, aggressive cichlids, you either keep them by themselves or use the "controlled chaos" theory and overcrowd the tank so territories don't get established which reduces aggression.