I have a sixline, but it is in my nano, not the big tank.
I must agree, sohals are aggressive, but my fish are handling him quite well. He is only chasing at times, at least he isn't nipping fins or killing. At least not YET!!!
I have the following in my main tank:
- Yellow Tang
- Blue Tang
- Sohal Tang
- FoxFace
- Blue Throat Trigger
- Copperband Butterfly
- Pajama Cardinals
- bicolor and blue/green chromis
- Yellow watchman Goby
- drucala goby
- dragon goby
- Flame Angel
- Potter's Angel