So I called the owner of my LFS to ask what piranhas they can get besides the reds and blacks. I am looking to take out some reds and add some caribas, but I wouldn't be terribly against throwing in a piraya or two if I take out enough reds. Well the guys response was "I can get reds, blacks, and golds" I didn't want to sit there on the phone and go "Well now are those 'golds' the pygocentrius? Piraya?" just to have him not know what the heck I am talking about. But is it safe to assume that buy "gold" that (Piraya) is what he meant?