Is Pink in or out?

I don't know about the singer "Pink" but "Pinky" our Pseudochromis joined the Tang last night. Dead. What the hell?????? I think that the Tang must have brought a nasty parasite or something with it...nothing else has changed. That really is the only thing that changed....we added him and the Puffer...a thriving tank with tons of life and color has now got 2 fish....lets hope they don't die too.