I have a very similar setup in my 150. I have a jag, GT, oscar, JD, 2 tinfoil barbs, 4 severums, 2 male black cons, and an n. livingstoni that wouldn't play nice in my malawi tank. I got them all as juvies and figured as they grew up I would separate out at least the severums and possibly sell the jag but so far I have no aggression at all. The jag is currently at 8" and he claimed his little territory behind a rock and besides shooing invaders away from his home is is very peacefull so far but I keep an eye out as they all continue to grow.