Hello, I may be re-thinking my decision on a black piranha and go with red belly piranhas, I wanted to ask you guys everything I will need to know, also if they breed what should I do with the eggs, I do not know where to sell them at. Also I am planning on not getting a tank bigger than 100 gallons, so how many can live their whole lives in 100 us gallons comfortably? I was also wondering if I got one piranha and kept it with my Oscar, would they get along their whole lives together? One more thing, are piranhas very hardy fish?