My 4-line was one of my first fish. I liked his personality at first - he would be all over the tank and interactive. But once he started to feel at home, he turned into a psychopath. Killed a royal gramma and a Rainfordi goby and nearly killed my female maroon clown, tearing her up a lot. I took him back to the LFS, where he was sold and returned 2 or 3 more times.