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Not sure how to make a large divider, but one thing you could try would be to pull the five belligerent barbs out of the tank for an hour or two, maybe change some things around the tank. Keep the five separate if you can (two in one bucket, two in another, and one in a third, if you have that many buckets). If you can afford to do so, keep them in a well-heated room so the water temp doesn't drop too far. Then reintroduce them, and see if the new surroundings make them feel like the "new guys". They might school up with the last one.
I'm not positive. Just basing this on what some people do with mollies.
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