On a scale of 1-10, I'd rate convicts a 4 or 5, simply because they take little to no territory up, even when breeding. Out side of breeding, I'd give salvinis a 7 and midas a 7.5 (they are peaeful if kept in large tanks, but even then, in large tanks I've had salvinis relentlessly beat other fish to death), but when breeding, salvinis are worthy of a 9.5-10 IMO. A pair of fish less than a foot in the wild can take up a territory that is more than 8 feet in diameter, and even larger cichlids that share it's habitat know to stay clear. In aquaria, they act like giant neetroplus neematopus, and will actively fly around the tank attacking anythign that gets in their way. Midas are the same deal, 9.5-10 when breeding.