One of my Piranhas bit half of my other piranhas tail fin off. And because that made it swim slower, the other piranha kept on attacking it. So what I did was I caught the bully piranha and cut a bit of its tail fin off with some scissors. This made them both swim slower. And it worked, the bully piranha stopped attacking the other one and now both of their fins are growing back healthily. Just thort I would share this experiment with you
