Even for a 180G, you may be pushing it with that combo. One thing to take into mind is with a pair of Cons, you'd have tons of mating going on, in a tank that includes all those big Cichlids, and thats just asking for trouble.
If it were me, I'd go with the 2 Oscars, 1 JD, 1 GT or Texas, 1 Con, 1 Firemouth or Blue Acara, and 2 or 3 Barbs, plus maybe a Bottom feeder or 2.
or I'd get rid of 1 of the Oscars, then you could have the GT and Texas, with the combo I just suggested above.
There's plenty of things to do with a 180G. It's just taking to many chances, with 2 of one kind, because of the possibility of pairing forming.
Good luck with whatever you decide. I love my 150 G, so I know you'll love the 180G.
