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But what prompts them to get aggressive? I don’t think they just go homicidal just because. There has to be a reason. Which I believe is food. Sorry. This reply was more meant for jdiedenbaugh than you.As far as numbers go, they’re like any semi-aggressive shoalers. In too small numbers, they’re more likely to kill each other until there’s one. Kind of like tiger barbs. In large numbers and a large tank, aggression is more dispersed. As far as three goes, it’s not unlikely that you’ll end up with one, simply due to aggression. There are success stories with small schools, though.