Interesting. Because they are so closely related, everything as far as taxonomy goes.
I’m asking because a person on another forum wants to stuff 40 of them in a 550g, with a sump, 20 of each. And I was very hesitant to give him a clear cut answer on that. He’s never had Piranha before and imho is not the best way to start out.
Another person posted : “...i had 2 - terns, 2 piraya, 2caribe, 2 super reds, 2 reds for quite some time... as a mixed pygo tank...
pygo mixed with pygo good -