Are we forgetting that this is only a 150 gallon?
You are already overstocked. Maybe not at the current size of the fish, but in a couple months, they will be quite a bit bigger. These types of cichlids/hybrids grow FAST. The overstocking is only because of the Jag and Flowerhorn.
That Oscar is going to get killed.
And the Jag and FH will eventually both want the tank for themselves, and only one will end up alive.
I think you need to do some research on the fish you have in there right now before adding even more fish to an already overstocked tank.
Maybe get rid of the jag and flowerhorn, and replace with something else.
dont be silly! a couple of months? Yeah maybe in a 55 haha! 150 gallons is heaps of room, for at least a year and a half if not more. If the tank is set up correctly, they will be fine.