Do different species of Pirhana school together?

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Personally speaking i have kept almost every single piranha there is over my nine years keeping fish and the only fish that i have had luck with sholing are the reds and a small pack of serr's. hollandi however after about a year and a half four of them ate the fifth. So good luck because when ever i have had a random serr. in the tank he stays out on his own.
 
Serrasalmus geryi have been successfully kept in groups

its a risk though, especially as they arnt cheap
 
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