Tbone, yes the two fish did get a long. The two fish had been co-existing wonderfully since Nov when I added the sohal. Unfortunately, right before I got my new tank, I removed a pair of maroon goldbar clowns that had been terrorizing everything their size.
It required me to remove all the rock, then put it back in.
When I did this, the sohal immediately began to dominate the purple tang in its new surroundings. A change of environment like that was all it needed to feel at home.
I was hoping that when I transfered them over, if I put the PT in first, it would assume some dominance, but over the past few months, the sohal has grown so much, that it is no doubt the alpha of the tank.