You were given incorrect information, Comets are not a small species. They can Easily reach 12" in length and are a heavy- bodied fishHello JH...
I've had these Comets for some time and they appeared very healthy at the pet store. I feed them a healthy diet and they get large regular water changes. I was told these would be fine in an aquarium setup. I know some varieties of Goldfish can get quite large in large, outdoor ponds, but was told the Comets are a smaller species and would stay smaller in an indoor aquarium. We'll see. I may need to move them to larger quarters.
TTG