Fin Nipping?

Hello, I’ve got 3 rosy barbs who live with 3 zebra danios. They’re about 18 months old. I’ve just noticed that the largest rosy bard has some splitting in its tail. It doesn’t look like fun rot (and the others don’t have any issues) but it’s just split into 2. Could this be caused by fin nipping? Thanks
Yes, and likely because of the incomplete school. I’d recommend getting at least 3 more.
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