I agree with emc7. Also, Rainbowfish are schooling and 3 doesn't make a school. They may be less timid with a larger group......but you have a lot of unfinished schools in your tank now. I'd choose 2 groups and bring the numbers up to 6-8 of each. Your fish would be happier that way. Definitely check you water parameters (preferably with a liquid test kit) and get that taken care of first before adding more fish.
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