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Schooling fish will often fight in groups less than 6, if they don't, then they often waste away. That's why they need groups of 6 or more, preferably a lot more if you have the space.I guess everyone has a their own train of thought on this matter. Schools are for protection as well as socialization. In his tank of current inhabitants, I would think that three would give the socialization they require and the protection is hardly needed. Just my humble opinion of course.. It's only a 20 gallon tank!
I agree that it would be BEST..to keep them in a school..but it is not a certain requirement to do so for the welfare and health of the fish.