just to clear everything up, i have been in to fish for about 8 years now, and I have owned a Red Belly Pacu. They can be sold in NY, but Not Piranhas. Piranhas are not allowed to be sold in NY legally. You can buy them on the “black market” or from a person who got it from PA. Piranhas can be sold legally in PA. A red belly pacu or called “tank buster”, become very affraid of movement by the tank and can actually bust out the sides of tanks. Red Bellys become much bigger then Piranhas and Red Bellys are not aggressive like Piranhas, here are the two of them:
red belly pacu
http://animal-world.com/encyclo/featured_pets/marine_reef_aquariums/BigG/bigG2.jpg
piranha
BTW i would love to pick up the piranha from you but i dont think he would get along with the Silver arowana in my 55 gallon tank