Check into these fish...I have them, they all seem very peaceful!
Fire Clown
White Cheek tang
Orange Shoulder Tang
Scribble Rabbit fish
Sarassum Trigger
6 line wrasse
green chromis
The fire clown is a bully to smaller fish, But he kind of has his own spot in the tank. Doesnt bother the tangs at all, he actually hangs out with the White Cheek quite a bit.