Thank you he is very aggressive eater right now I hope it stays that wayPersonally, I would just make sure he is eating and not being stressed by others.
If you can’t QT and treat, then ensuring he is as healthy as he can be increases his recovery odds.
Take your time planning for a longer term properly rated unit. Adding a new UV now at whatever size isn’t going to “cure” the fish impacted only disrupt the ich life cycle and help mitigate future outbreaks.

