Hey welcome to the board Azn! The piranha that were shown on the page were bought in Pennsylvania. They are only legal in certain states so do a search on google and you should find that info. A couple of my boys on this forum know a little more about feeding and what not so i will let them answer that part.
mine like squid chunks, gold fish, shiners or actually any fish i put in the tank. they even ate some fish that people told me they wouldn't eat, like a 4" pleco, and some red eye tetras that they grew up with....they even eat each other if your not careful. they also have an incredible hunger. they are always hungry....they were the size of a nickle when i got then, and now they are 4", and i have only had them for 3 months