You don't need salt or Melafix. Keep his water warm and really clean and it will heal on its own in a week or so. I've had severums with gashes in their heads from running into driftwood while chasing each other, and it usually heals over in a day or two. It's just missing scales.
Clean water is the key. If it's not clean, there's always the chance he'll end up with some kind of secondary infection.
Clean water is the key. If it's not clean, there's always the chance he'll end up with some kind of secondary infection.