Is this a foolish idea?

[Negrodamus]

it would be foolish.
keep us updated on your current cohab as well, as long as it works, which i predict wont be long.... do you have pics of that tank?

 

[Trucker84]

This is one of the few Serrasalmus-species that has been shoaled (more or less) succesfully. To accomplish this, a very large tank (the minimum is 20 gallons per fish when small, more when larger) is absolutely necessary, due to its fin-nipping and agressive nature.
-quote from aquascapeonline.com

i have 7 Piranha and 140 gallons
all my fish are motivation for upgrades in tank size down the road

 

[Jfitz]

nice aquarium ^^
and there should be like a sticky or something preventing pple asking about piranha compatibility, even though this might be a special case or wtv...