Some brick-and-mortar aquarium shops as well as online sites, such as AquaScapeOnline.com and AquariumFish.net, offer piranhas for sale. Many states strictly control or prohibit ownership of piranhas.
Piranhas need large tanks with a minimum of two gallons of water for each adult fish. Filtered water maintained at about 80 degrees Fahrenheit is essential to keeping piranhas healthy in captivity. Owners of piranhas cannot place any other fish species or aquatic animals in the tank with piranhas. Piranhas eat a variety of foods including meat, fruits and vegetables. Owners should limit giving captive piranhas live feeder goldfish, since these fish may cause disease in piranhas.