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.