In order to get fish to shoal I find you need a fish or two that are a tad on the aggressive side to chase the shoal around a bit otherwise they just get comfy and go about their own business. It's pretty tough to pull a shoal off in a 75 gallon tank...I would venture to say almost impossible. Much easier in gargantuan tanks of several hundred gallons. Banggai Cardinals shoal pretty well if you have say 6-8, but that's too many for your tank.
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~ Mindy
SPS fanatic.
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