Black piranha scientific name is serrasalum rhombeus yes. Some will agree and some will disagree. But all of the piranhas that have to be kept by them selfs grow way slower so you can get away with a smaller tank. A pygo will be 6-8 inches in 1 year. People say you can keep a pygo solo. Sure you can do anything you want. But I look at nature and see that in nature they are always in a shoal. So if you want a single piranha get a single piranhas but take your time and look Into it. And honestly a single piranha sucks. Doesn't matter what kind it is.
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