Salvini would be up to you. A female would be much more docile, but a little less colorful. Salvini are entirely possible as long as certain precautions are made. Make sure the salvini starts out smaller than the Oscar. Personality plays a big role in this match up. You either need an aggressive Oscar who could stand up to a salvini or a calmer salvini who won't pick a fight constantly. Everyone's experience with them is different. Every cichlid has a different personality that can make or break a setup. Are they an aggressive cichlid? Absolutely. But so are convicts.