That's a nice tank size. Still gotta keep in mind that jaguars are killers, if you have a particularly crazy jag you might not have much luck keeping other fish in there. If he's mellow, ,you might be fine.
I would avoid other parachromis species that look similar to the jag. I also would let him be the king of the tank, don't put other fish that will challenge his dominance. If you put other fish that stay a little smaller (easy given how big jags get) and don't look like him, you will be better off.
Red devil, tetracanthus, lyonsi, salvini, texas/carpintis, convicts, jack Dempsey. These are good candidates.
CA communities are like balancing acts. I can't tell you these fish will definitely work. Only way to do it, is to put some in and be willing to sell/add fish until you find a balance that works. Don't drop fish in one at a time, they will be singled out. You should probably keep at least 5 or 6 fish in here if you want a community, so that they are all somewhat distracted.
Good luck. CA communities are awesome, but are easier said than done, and almost always have issues.