by properly kept you must mean in a 600,000 gallon aquarium, and force feed steriods, they don't get past 15-16" MAX in home aquaria< belive me i've raised plenty, wild males do reach to 22" in the wild, but that's with a whole lotta room, and alot of food. aggresive wise it all depends on the fish, i have had jags that are pussie's, and liosellie that are badass, as well as vicea versa, in general jaguars have been known to be more aggressive, but most aggresion i have seen is basic territorial instinct not dovii psychoticness. lioselli do max out at 14" females ussally run a little smaller than males. there the same genus, that would be the "parachromis" family of fish. you can tell them apart by that lioselli are yellowish coloration, and almost always have a light blue marking patch on forhead which sometimes streches to the lower dorsal area.
