Is a complete ignoring of the aggression 
I got a 9 inch aro shipped to me yesterday and put him in with my little 3 inch GT. Probably a bit less than 3 inches.
Anyway this GT really has some balls, within 10/20 seconds it was getting in this MUCH bigger aro's face, biting it's side and nipping it's fins etc, then I felt so sorry for it.
It made such a brave move, and the aro just acted like it wasn't even there. No aggression or fear back, just completely ignored the little GT and carried on gliding around
The GT looked confused and despondant.
I got a 9 inch aro shipped to me yesterday and put him in with my little 3 inch GT. Probably a bit less than 3 inches.
Anyway this GT really has some balls, within 10/20 seconds it was getting in this MUCH bigger aro's face, biting it's side and nipping it's fins etc, then I felt so sorry for it.
It made such a brave move, and the aro just acted like it wasn't even there. No aggression or fear back, just completely ignored the little GT and carried on gliding around
The GT looked confused and despondant.