i have done a lot of research. i asked if they could get along i didn't ask what size tank i need.
Generally any research on piranhas would have answered that pretty easily for them (as well as pointed out that a lone piranha is not a good idea to begin with).
Not to sound mean or offensive here, but your statements/questions so far haven't really given the impression of someone who has researched a whole lot on these fish. It looks more like a list of 'cool' monster fish that don't really have much reason to be together, so without much more information from you on setup/experience you are going to continue getting a whole thread of "no, they will get too big" replies.
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