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While not as combative as some of their larger bretheren...the Cherry Barb (Puntius titteya) does better, in my experience, in a group that includes a male and two or three females. Male Cherry Barbs will fight for dominance on occasion.
I've discovered an interesting phenomenon with my particular cherry barbs. When there are NO females around the male cherry barbs don't seem agressive toward each other at all (particularly if kept in a group of 3 or more) I have 6 male cherry barbs and no female...they get along GREAT. I'm sure the situation would be different if a female appeared on the scene!
They will "race" each other around the tank from time to time, but all in good fun. No fin-nipping or aggressiveness whatsoever.
Cool. Two votes for 'just male cherry barbs alone'. That is neat to know. In fact it strikes me that fish are a lot like men...get along fine until a pesky female comes along. Then they start fighting over us. lol