[coral reefer]

I recently purchased a Coralife RO/DI filtration four stage for about $150.00!
Do you plan on keeping corals in the future? If so scrap the UV sterilizer, in my opinion! It will kill numerous beneficial organisms within your tanks chemistry and equilibrium.
Unfortunately, anything is possible in regards to one fish having a negative impact on other tankmates in your tank, so the introduction of a Powder Blue Tang is not out of the realm of possibly effecting other tank mates if it wer to get sick and die.
Trying to offer it the right husbandry and compatibility conditions and requirements is essential, with the learning as much about your beautiful fish, or any other animal you wish to maintain in a captive environment, being essential to your and the animals long term success.