Powder Blue with Regal and Purple Tangs?

[Aquattro]

I added a PB to my tank with an existing yellow, after a few days of tail wagging, they get along fine. My PB did not get any ich. As stated though, purples are fairly aggressive. I'll be adding one as soon as I find one though....

[fkshiu]

I've got a regal with a purple and everything's been okay. Mind you the purple was added when it was much smaller than the regal. The tank has always belonged to the regal and every so often the purple gets a reminder with a nip to the dorsal fin.