I have a Brown African Knife in a 125 gallon tank with 2 Severums, 1 Polleni, 1 Nicaraganese, 1 Robertsoni, 1 Chocolate Pleco, 10 Yo-yo loaches, and 6 silver dollars.
They are predatory and they also are slightly electric. Not like the electric eel or anything, but they can give a slight jolt. My other fish in the tank, give it a wide berth.
I am debating on if to move mine into my 125 or find it a new home. I was sure he would eat the tetras and guppies, wasn't sure about the angel. But I am really more concerned about my cory cats. I know they are small enough to eat, but will it chase a bottom feeder?