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If it was alleni damsels you would be fine as they are happy in pretty much any sized group. My experience with yellow tail and other chrysiptera damsels is that they prefer to pair rather than group and only with space do they coxist without much trouble. You seem to have plenty of room so I think you'd be fine. I'd personally look for small ones that will change sex to suit the situation. If you get larger ones you might end up with too many males which could cause headaches, whereas letting the dominant females of each little group switch will make it smoother.
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