Let me put it this way Steve.
I have 18" mono's with my Pinima, my 12" Orino always took grief from the Pinima and the Monos even took grief from the Pinima, I picked up some Kelberi and the Pinima was just out to kill them - it was soo intensive so i had to move him to my friends tank.
I moved this pretty large aggressive Pinima to my friends tank who also has an Azul from the same batch as you.
Guess what happened? The little 9" Azul start hitting my 18" Pinima right in the face LOL
Obviously i wasn't concerned nor was there any damage but he was more than up for the fight!