sixline aggression

Has anyone had problems with there sixline attacking clowns. He killed one of my knew percs then started working on the other one. The week before that he was swimming around the tank with half of my cleaner shrimp in his mouth. Not sure if had died or if he just killed it.
 
My six-line and my maroon clown get along just fine. I've had the maroon for quite awhile; the six line since midyear last year. The maroon tends to stay in the bottom third; the six line stays in the middle of the tank.
 
6 lines gets very aggresive and territorial as they get older. Usually if they are close to last things are fine but if you add a non-agressive fish after they are well established it is rolling the dice! Some people have problems, some don't.
 
He was one of the first three introduced.I got a 5 inch blue hippo at the same time as clowns. He seems to leave the hippo alone, but he would not stop hitting the clowns. He killed the smaller perc. then started working on the bigger one. I had to move it to the fuge. We tried to catch him last night but could only get the clown out. We are thinking of getting rid of sixline.
 
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