Upon placing the four into the tank, they all showed no aggression. The larger female flared, showed her fins, then left them alone. Then, she turns into a piranha and starts abusing the others.
I understood what to expect, but, it was getting out of hand. A few of the newcomers were starting to get weak. So, i netted her and placed her into her cup.
Not to mention she is much MUCH larger than the other 3, due to her age. She is most likely 6-9 months of age, or maybe more. The other 3 seem like 4-6 month olds, since they are so tiny compared to her. I can gladly get an image of them, if you'd like