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depending on the sex, either get a minimum of 2 more or get rid of them completely, they might might be fine now, but they WILL kill each other, if its a community tank or a mixed tank just do away with them entirely, i hade success with 4 before but it was 1 male and 3 females and another time with 8 of em, you need a large school, or m/f ratio close to what i had.