ok, i want to add 1 kind of south american cichlid to my silver arowana tank, something that grows fairly large (at least maybe 10" or so) and is not overly aggressive nor territorial. so what do you guys suggest? i bought a tiger oscar yesterday and tried to add it to my tank. after i ate my dinner, i checked the tank and saw the oscar chasing my flag tail. and i'm like wtf? i almost threw the oscar out the window but then realized it was bad. lol, so now he lives in a 15G (solitary confinement) until someone wants him.