Hey i think that if a fish is ggoing to DIE it's going to die in the acclimation mode.
It's a fact of life being caught then put into a bag for 15 -20 hours then going into a mode to get the salinity up to PAR!!!.
I think that is the way you are going to lose them,
PB TANGS are real easy to freak out ,tghey are ICK getter's like all tangs. But more so on their part DOug had one and i was up to his house and walked by the tank and the fish received ICK. And all doug used was Garlic oil from the health store. That is all I used for my yellow and purple.
Mike