Ahhh I stand corrected, I thought PBT referred to Powder Brown Tang.
Unfortunately powder blue tangs are unlikely to forget the personal vendetta id it lasts more than a week. A lot of damage can be done in a week, however. I consider the PBT the most aggressive tang by a large margin. Not because they do the most damage but because of how relentless they are and how frequently they behave that way. I have personally removed PBT for badgering fish many times over the years, for up to one month, to add the fish back for it to immediately resume bullying. They really don't forget, and unfortunately smaller quarters exacerbate this. PBT in the wild defend their algae to the death and are accustomed to doing so because otherwise they can and will starve.
You are free to try anything, but my bet is that things work out in a week or two or that they never will. Here's an article on tang aggression I wrote if you're interested:
https://www.reef2reef.com/ams/tang-aggression-understanding-and-combating.76/