i would not put 1 oscar in anything less than a 75 gallon aquarium. well maybe with the exeption of a few schooling fish.oscars dont need 65 id say 50 limmit i see oscars in 75 gallon with lots more cichlids and the oscars are big ass id say i could fit 3 oscars comfortably in 75 with good care filteration but i dont cause its harder to take care of. so ima prob get a palmas bichir or delhezi with 1 tiger oscar 3-4 inch long and juvinile bichirs 2 or 3. god you say you need such big tanks but reality i see people on youtube with 100 gallons that are way to overstocked! but im not one of those peopel so il get 1 tiger oscar and 1-3 bichirs down in there and yes chances are it will work id say 88% it will due to many people doing it and with succes!
+100,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,Just because someone has done it doesn't mean it should be done. I'm relatively new here (although a long time lurker), but if people are telling you you shouldn't do it, I wouldn't do it.