Never seen it attack a thing. Doesn't even nudge anything. It's been in with flagtails, silver dollars, indo dats, stingrays, tinfoil barbs, etc. Never any issues with anything.
I end up doing the same thing. It's been working out better with the new pellets I've been using, it gorges on them and hasn't eaten as much fish. I can see that problem with a lince too. Catfish in general can be pigs, and pacu. Let me know. It is an awesome fish, my focus has just changed a bit and it's not fitting in as much.