Koran Angel & CBB fighting in QT?

[LoganGG]

I currently have a clown, cbb, and koran angel in a 40g qt tank. All has been well, everyone’s eating, but recently i’ve noticed the cbb and koran may be fighting? The angel chases the cbb, then the cbb does circles around the angel with the top of its fin angled at it. I added some more pvc in the tank to help add more hiding places. I just wanted to see if anyone has any experiences with aggression with either of these fish.

 

[blaxsun]

Angelfish can sometimes be *****. So in a 40-gallon, I'm not surprised.