I currently have sens and oscars in a tank at my work and they are doing fine. But like everyone said before I had trouble at first getting the right amount of food in the tank were the sens got some but I didn't over feed the Oscars. My solution was kind of weird, my oscars don't particularly like krill because they don't really know how to eat it because they were raised on pellets but my sens love it. So I feed krill as a staple and the sens get plenty and the oscars get a nice supplement to their usual pellet diet.