The short answer: BAD IDEA!!!
The long answer:
My husband bought one very small JD and six various Oscars (2 albino tigers; 2 black tigers; 2 red velvet) for our 150 gal. tank. The clerk at the fish store said they would be just fine. Little did we know that Jack would double in size within a matter of 8 weeks or so. At first, he hid in one of many caves and led us to believe he was shy. Let me tell you how wrong we were! He started picking on nearly every fish in the tank and caused so much stress to the other fish that I thought he was going to kill all of them. I rescued the first victim (black tiger) and put him into the hospital tank for a couple weeks; once he was healed completely, I put him out in the pond with the Koi, which is working out very well for him and his pond-mates. He is difficult to see, however. I left for a two week vacation (everyone else stayed home) and came home to find that the largest fish in the tank (red velvet) was no longer largest, and cowering in the corner; he also has about half of his scales removed, no doubt by Jack. Big Red is now in the hospital tank, but I doubt I can put him in the pond. The next step... I am cycling a 55 gal. for Jack to be exiled to; once ready, I will let Big Red go home and try again. I think this may be how so many people end up with so many fish tanks. As it is, I already spend several hours a week vacuuming yuck from three tanks and one pond since they must be cleaned weekly.
1 150 gal. Oscar tank
1 10 gal. Hospital tank
1 10 gal. Kamikaze saltwater tank (started with water and sand from nearby beach) with 2 shrimp, 1 mystery fish, coquinas etc.
1 1000 gal. Koi pond
1 55 gal. cycling for Jack's jail