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Yes, they should school together. What is the number of barbs you have? The larger group, the less likely they will pick on other fish(if you have them in the same tank).
Thanks very much, I've got the normal yellow/black type x3. I've had them about 2 years and they've always been fine, I heard they are happier in bigger groups so wanted to up the numbers and was thinking about the other coloured types as options.
Try to add as like sized fish as possible. If your new barbs are significantly smaller than your current ones, you're likely to have trouble with them being bullied.