got me a new jack today that same size as my oscar and they are together now no signs of fighting yet they actualy cuddle together. My brother is going to take the baby jack i have in other tank, and put in his 125 gallon tank and let him grow. will post pics up soon of two of them together and if can one of them cuddling lol

got my first little fight was over a feeder lol the both had it on each end and ripped the fish apart so they kind of shared lol the both got half and are calm now lol

You put these two in a very dangerous situation. Soon these "little fights" will become blockbuster brawls. Food can be rip into 2 pieces, but territory and such things can't be. So keep both your Iz on them for now.

I never had any problems between my dempsey and my O's as they grew up together, bear in mind that an O will grow much faster than a dempsey!

And that's a reason it could become a food for it. Of course, the dempsey I see in the picture, is definitely not going to be food. Anyway, don't underestimate the aggression the may show. Just be careful. That's all.