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Meagan, if your tank can acomidate more fish, add a few more platy. This will spread the aggression. Your betta will not be able to focus on an individual fish. Good luck.
Thanks, V227, i ended up moving my betta out of the tank and putting my platy back in. my betta is in a 3 gallon and my platy is in a 5 gallon. they seem to both be happy so far but i'm looking into other arrangements for them