Hi all! I noticed this bump on my tangs mouth when I it home from the LFS several weeks ago. It was just the initial bump at first, so I thought it might just have been trauma or a bite from another fish at the store, and decided to monitor. Tang is breathing fine, eating well, no flashing or scratching. But it does seem to have progressed up his face on his gill towards his eye now. Any ideas? Do I need to medicate?