You are right. However in large tanks they do get pretty big. My largest ten will be 15 years in my tanks on November 22 this year. One died in 2011 and it measured 13 1/4" total length. I never measured the disk. It was not the largest in the shoal. you can see the shoal in the 15,000 video in my signature. The tiger oscar in the tank video in the 10 to 26 mark is around 11" as a bit of a reference. It measured 10 1/2" when it was placed in the tank in dec 2008.
Mine eat Sinking pellets up to 7mm. A few floating pellets, flake food, small cichlids bred in the tank, herring, mackerel, tilapia, silversides, smelts etc. They also munch on fruit and veggies when I put it in the tank.
Great fish and I really like mine. I hope you have a good time with yours.
