I have had 2 oscar for some time now since they were just a couple inches big. Now they are close to 10 inches. They have always gotten along fairly well. Im not sure if i have a breeding pair or a fighting pair.They will occasionlly chase each other around, stare each other down, turn from a dark color to a bright color, their tails will vibrate, then act like they are fighting until they lock lips for a second or two and they are done and go about swimming around together. Do I need to seperate them from the other fish in the tank? Do I need to heat the water some to induce breeding? Im not sure what to do i wish they would breed and have oscar babies...