Gold Spilos are one of the most agressive piranha, the natives in peru are scared of them because they have the most encounters with people due to them being so teritorial. They will attack anything that comes in thier area.My spilo definatly fits those characteristics, I even have to have someone else watch him while i clean his tank. I've had a couple close calls before Heres some pics..........
either rhoms or black piranha. but you have to keep them alone. if you want more than one piranha get reds. i have 3 and they get pretty fiesty durring feeding time.