From my personal experience I would have to say no with the cichlids that I had (mainly I think the Jack Dempsey finished him off). But there is all different kinds of cichlids so I guess it depends on what you have.
I got blood parrots, severums, and an ebjd. Odballs include ornate polys, featherfin catfish, and a fire eel and bgk when they get big enough. Tank also has bala sharkd.
aggression wise id say ur okay i just hope u got awesome filtration, other concern would be growth rate on pbass vs. EBJD cuz if the EBJD isnt already full grown the peacock may outgrow/eat it
I would repost this in the cichla section and see what they had to say. I would still say not a good idea. Chiclids can take a beating but in my experience pbass cant. (or mine couldnt. I had Tems)