I have a powder blue and purple in the same tank. Hard to say, you can never tell with some fish. One think I would try and do is introduce the docile one first or if you don't have a choice both together.
You can mix tangs, and even those two, but I wouldn't put them both in a 150. The naso will get way too big. I would suggest a yellow tang or one of the smaller, more docile acantharus like a convict or mimic.
Probably not, powder blues have a reputation of being very aggressive. If you wanted to keep one tang that would work out, but nasos are pretty mellow overall so a pbt isn't a very good tankmate unless it is a really large system.
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