I want to, but they're greedy fish lol the Trachy I don't mind as much, she's happy with pellets I haven't seen her eat anyone. The wolf at 8" tore up a 5" jag cichlid as food even though I haven't offered live since maybe a year or two before I even acquired him. And my odoe wouldn't eat after I had to pass on my curupira and ended up passing. So now I have a 4-5" jaguar catfish, 10" Trachy, and 9" gold wolf. The wolf hides in the dw whenever I'm around now. Cats come out for food and to swim at night. I do wanna get another 2 jaguar catfish. And I wanted to get some loaches and SD again. Just don't want them to become food. I was interested in tats a vendor has but at 5-6" I think one bite from the gold would end it. Wes has chaca chaca cats, was thinking about that, the gold wolf doesn't seem to bother catfish, its more of active fish that I guess trigger his predatory instinct; but you never know with predators. Been toying with lots of ideas but reluctant to jump on any. I'd agree with you, once fish have been together for awhile, they definitly learn to coexist and any introduction or deduction usually throws off the entire balance of a tank.
