You can keep schooling species, and really most of these in groups. The problem is you need room and numbers to keep the group, you would want more than 3 males. And you will still end up with one male showing alpha color and each male beneath will show some degree of less color. In smaller tanks, you really would need to keep it too crowded than one would want, would be less ideal and kinda boring.
Really, it's all about pecking order with all of these fish. You always have an alpha and a beta. By mixing up with different species, you can try to get a few different males to color up and reduce direct competition. In larger tanks, hobbyists don't really want to waste the space on just one species, more fun to mix them up.
Sometimes peacocks will tolerate other males if there are a lot of females( single species tank like DJRansome said) . But you would need a large tank and several males not just two. However for this to work they would have to grow up together as a group of juveniles. This is risky though as you could get a hyper dominate male that will kill the other males when he hits maturity. Hope this helps.
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