I currently have a 90 gallon tank with 2 large oscars between 7-9 inches long. The 90 also has a big pleco thats about the same size. I also have a 35 gallon with a Jack Dempsey about 3-3.5 inches long and a Sun Catfish thats about the same size. I was wondering when it would be smart to put the JD and the Catfish in with the oscars because I dont wanna lose any of them. The JD lived with my RB Piranhas before and is very aggresive but I know how oscars are and wont chance it. Thanx!