My experiance. I have had my 3 blue chromis for 1.5years now. They have always schooled together, they do pick on each other but more a higharchy kind of thing more than aggression. The odd part about mine has been growth, there is the big one, the medium one, and the runt. They were all almost the same size when I got them, and are now all very noticeably different in sizes.
I vote 3, I had three in my 55g, and in my 120 it seems empty with only three, but I would create chaos adding more now in a established tank with settled fish.
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In today's world of nearly instant everything and what is exceptional today is only par tomorrow. My Reef is the only place where I must wait, and do so with glee.
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