Hmmm Mine was with Austraillian Rainbow Fish. Though My rainbows seem aggresive he the Knife is tougher and never gets picked on. Nothing happened with him with a a spiny eel. Though the knife chomps down on Ghost Shrimp and Earthworms and an occasional Guppy here or there. Just Nothing Like a Neon Tetra. I hear they use electrical currents to find stuff in the dark. Then I dont think its a good combo with an elephant nose or a Black Ghost knife.
umm no i dont think an african brown knife uses a electrical organ to find its food, technically its not a true knife. but iunno if thats correct or not i just remember readin about it.
Back to the original question of what you can keep with Xenomystus nigri - the African Brown Knife: I currently keep mine with Bush Fish (Ctenopoma and Microctenopoma species), medium-sized bichirs (Polypterus species), African Butterfly Fish (Pantodon buchholzi) and Synodontis catfish. It generally isn't a good idea to keep them with other Knife Fish or with Mormyrids (Elephant-nose Fish) because they're all considered to be 'weakly electric' and there seems to occasionally be a problem with their electical fields interfering with each other and leading to fights.
