Only thing to be concerned about IMO, is that he wont hesitate to eat the plecos or any other catfish. My chaca chaca used to eat Corys, and I had to remove one from its mouth once because they stuck out their spines in he mouth.
um, yeah...i tend to agree with the above poster. The chaca might help himself to a snack here and there with those other fish. The size of their mouth is enormous. I had a senegal polypterus years ago who loved to feast on pictus catfish and any kind of pleco. Would've thought they be safe...