Piranha
Piranhas are flesh - eaters and can eat you alive. Their teeth are as sharp as knifes and they can tear you apart very fast and easily. They sometimes fight over prey and they do what they do to their prey. If you see a tank full of piranha Id stay away from it and don't tease them or they will jump out of the tank and literally bite you and wont let go. I would stay away from them.
