Although I do not have this combo, I have a purple pseudochromis with a Ocelerous Clown,2 Green Reef Chromis and a Hippo Tang. I was quite concerned as they are in a temp housing of a 29 gal tank and was told they could have a bad temperment.. However the purple pseudo only goes after the Chromis,every once and awhile,and just to chase them off. It will swim with the Clown & Tang,but the Tang is the head of the tank.
Sorry,I know it's not exactly the combo of your question,just thought I would share a little of the fishes personality