I've had/have
2 azuls
4 orinos
6 tems
a few monocs 1 big
and a tem hybrid.
The one of the 4 orinos that I got a while ago was the most aggressive of any that I've had. Once he hit about 6" and was in a 90g he had no more issues. When he was very small, he beat the CRAP out of the two azuls he was with. The azuls showed a little aggression toward each other, but nothing compared to the orino. The 3 small orinos I have right now have never shown an ounce of aggression toward themselves, 3 prochilodus (bigger than them), a group of 7 clown loaches, a niger and a payara.
It really just depends on the particular fish... not necessarily the sp.