Aggressive Clowns

[ginger7286]

I have 7 Percs and have never had any problems with them. About 2 weeks ago they started becoming aggressive with each other. I am going to have to remove 2 of them from my tank and place them in my Nano. What causes this? They were all purchased around the same time (9 months ago) and have gotten along famously until about 2 weeks ago. Is there anything I can do besides seperate them?

 

[Don-Coraleone]

maybe some of them have paired up and they are become aggresive because they are going to spawn.