I've had the little ones since early December but I've had George for almost two and half years now. I rescued him in a way... I knew a guy from class that invited a bunch of us guys over to watch his new "pets" eat, so we tagged along. When we arrived I saw two pale white Piranhas in a 10-15gallon tank with nothing in it but a air stone. He threw some feeders in there and they didn't do anything for a long time.
After a while he was very upset and decided he was going to kill them... So I told him I'd pay for them, and took them home. I didn't know a thing about Piranhas, tanks, cycles, or anything else so they may have not lived in the perfect condition for a little while. But I worked with what I had... I called in a few favors and got a tank, filter, and heater for them.
The good news is their color returned and so did their appetite. The bad news is I still didn't know jack about Piranhas... Then one day the power cut off for three days and Georges roomy died
Finally I started finding sites like this one and now my fish are much happier.