what can I do with a fish that keeps attacking the other fish?

Alex

New member
i have resonantly bought fish 4 guppy's, 2 sordtails, 2 Molly's and 2 plattys. One guppy keeps attacking 2 sordtails what can I do about it?
and i only have one tank am i in my rights to chage him for another one?
 
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