brazil

We got a beauty of a Xingu Peacock Bass here looking for a great tank to go in! It is currently about 9''-10" and going for $250.oo

I bought this piranha from the local fish shop today. He couldn't give me a scientific name. He just said it was a "True Black Rhom". He said he picked it up from his wholesaler a couple months ago that had gotten it in a large shipment from Brazil. Does anyone know the species? If you...