Well picked up the tangs today. Purple is about the same size as the
powder blue (that has been in the tank for just under 2 weeks now). The
sailfin is about 1" larger than either tang. Both the purple and sailfin came from the same tank. (purchased from a local reef club member who has had each of them for about 3 years in a 125gal tank)
The powder blue is currently ruling the tank. Both tangs were sent to the corner and held there by the powder blue. Whenever they tried to leave their designated spot, the powder blue would come back and put them in the corner. I let them try and work it out for about an hour and then turned off the lights on them and will see how things are going in the morning.
For now, the powder blue is definately trying to rule the tank.
I did shoot a quick video of the tang introduction (about 3 min into it before I realised this may make a decent video).
Michael