She starts out in freshwater, moving to brackish, and finally full salt as she matures. If you want to learn more about the species, you can also search under arius seemani or columbian shark.

Even as a juvenile, the columbian shark should have some salt added to the water. If you do have a pictus in the tank with it, the salt will burn the pictus (as a scaleless catfish, the pictus will not take kindly to salt).