I have kept many CA, SA and African cichlids for years but oscar is one cichlid I have never kept. I always wanted to keep a red oscar to contrast with mostly blue and yellow Africans, but I never tried. I know oscar is one of the most peaceful cichlids so aggression is not my concern, but my fear is that oscar is piscivorous and will eat small Africans. I always hear people feed their oscar pet with goldfish. I am surprised and glad to hear that oscar can be safe with small fish. I guess it depends on what you raise oscar with. If you raise oscar from baby with dry food only, they may never acquire the taste for live fish.
I had a 10" JD that would not touch guppies, because he was fed with dry food in his whole life.