Why is it in your frag tank now?
It should be in QT at once, I tend to think.
I always use UV to reduce the incidents of bacterial infection, but when there is large open wound I will opt for treatment with antibiotic at once. My first choice is mostly erythromycin for five days.
This drug tends to harm the nitrobactor class of bacteria more so you will have some nitrite but not very much ammonia when you use it if there is existing good nitrification in QT. If you don't, you will need massive WC for a few days.
After several days of antibiotic treatment I will resume UV.