So another question. I have a 285 84"x30"x26" tank with polypterus, gar, and 2 irwinis in it. Is there another medium sized (8"-12") catfish that I can put in there that won't eat any of my smaller 6"-7" polys, and will be out an about? (not exactly swimming, but not making me question it's existence like my irwinis). Also it doesn't have to be african, but if there was something african that fits the bill I'm all ears.