Wow, (crossing fingers), my 6-line doesn't bother anyone. I've got a 55 cube with a coral beauty, 2 blue cleaner wrasses, a yellow clown goby, a foxface, a blue hippo tang and a pair of occellaris clowns. The blue tang and the foxface gang up on the coral beauty a little, but once I have my larger tank set up this should stop. However, the 6-line is one of the more peaceful inhabitants.