Calvus almost always are sold as small juveniles, you can grow them up enough to be able to sex them and then if possible rehouse them once you have a pair. Either that or you can order online from various very reputable sources as a sexed pair.
You can do a breeding group of peacocks in a 40g breeder tank, 1 male to several females, peacocks are fairly easy to sex as males are the only ones who color up, females remain a brownish color.
If there is a good ratio of 1 male to females and there isnt too much aggression from the male towards the females then yes. There are also other factors, the tank needs to be to their liking and setup so the females can escape the male aggression when he is in breeding mode.
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