Tempestuousfury
Fish Aficionado
One of the platies in my 55 is chasing after one of the others. It seems like courting to me, not agression. They both seem to have gonopodiums, but they're only 3-4 months old and one could just be clamping its fin (I doubt it). The one being chased is also bigger than the other, so since female platies are bigger than the males...