Be aware that Powder Blues are notorious ick-magnets and any stress, such as the aggressive attention of another tang defending its home territory will almost certainly cause it to break out with ick. My 80w Aqua UV sterilizer keeps ick at bay but just. Purple tangs tend to be quite aggressive IME and I would hesitate putting an ick-magnet in with one. The only positive is that PT & PBT have different body shapes and colour, so that might help. My Yellows don't pay any attention to my PBs.
Anthony
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If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it!
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