Here is the deal, I have owned all the pygos at one time or another and most multiple times, multiple shoals.
Everyone is going to say that Cariba(and Piraya) are the most aggressive of the family. And many people are also going to say it depends on the fish. I think this mostly has to do with single specimans. But it is true
Cariba in my opinion are more aggressive in general then reds, they have a large lower jaw, they tend to eat more food and are usually less skittish
However, I have kept 5 cariba in a 125g tank twice now without any aggression at all. They are great fish. But make sure you feed them a lot!
Everyone is going to say that Cariba(and Piraya) are the most aggressive of the family. And many people are also going to say it depends on the fish. I think this mostly has to do with single specimans. But it is true
Cariba in my opinion are more aggressive in general then reds, they have a large lower jaw, they tend to eat more food and are usually less skittish
However, I have kept 5 cariba in a 125g tank twice now without any aggression at all. They are great fish. But make sure you feed them a lot!