06-21-2013, 06:23 PM
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Peacocks are peaceful until they are put in an environment as to where they have the ability to bully other fish, if you give them the opportunity to do so then they will absolutely walk through the door. Putting a male in the aquarium will only further the aggression due to the fact they will always aim to establish dominance, which is something that is unavoidable in the cichlid world. It's not a matter of if it will happen, but when.
YMMV, however, you could experience no issues considering there are no suitable mates that would be in the aquarium and thus no reason to shred mating competition. However, the aggression is dormant is most "peaceful" cichlids and will emerge eventually in the manner of which the incredible hulk does.
Hope this helps.