Here is my O. Niger cat. He is about 15". This is a pic of him in hunting mode. Notice the raised dorsal fins....he is hungry. They are perectly adapt to eating virtually any kind of sinking pellets or prepared foods. This fish is and never will be considered agressive. They are awesome to watch when they swim around hunting, but also they do sleep most of the day with fins tucked in and motionless. Carnivore pellets are best for these guys, and plenty when they are hungry.
Good luck!!!

Good luck!!!
