i have a jar-15" with a gt-6", jd-6" and a 7" female festae in a 85g rite now. i'm moving 'em into a 180g this summer when i move. i a couple of other fishes in the tank also, but as far as the cichlids and the jar are concerned, they live with each other just fine. i wouldn't say peacifully, because the jar bullies all the other fishes around. chasing 'em, biting 'em (or tries to). however, i provide sufficient shelter for the cichlids, like drift wood, big plants, caves...etc. this way, even when the jar chases 'em, they don't get hurt.