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They're not schooling fish. Social, yes, but not schooling. I had a male guppy with a big tail that was bullied and nipped by his 'friend' that I had in the tank with him. He was much happier and came out more when the 'friend' was removed. I've kept guppies in quantities of 10+ before all together. I have seen no difference in their behavior alone versus with others as long as they feel secure in their environment, which in a fish tank they should. No predators.