Depends on the fish and size of tank. Ideally I wouldn't add it by itself, the purple tang is generally a pretty aggressive fish.
Unfortunately I don't see that working out. Rehoming is probably your best bet.
Thank you for the advice. I have a friend that can probably home him. Would a fox face be an issue with the brown? That is my only concern with it going to his tank. Good news is that the brown is recovering very well in the sump currently.