Silver Dollar Nipping

Hi, new here. I have 6 silver dollars that have been together about 2 months. The largest is probable 3 inches. They are alone in the tank with just a pleco. Recently one of them has serious fins nipped away. The dorsal and tail fin are nearly chewed off. That one is definitely now a lonerWondering if the largest one is attacking it. What should I do? Thanks and glad to be here.
maybe buy aquarium separators or maybe introduce a meaner fish just a suggestion

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