Depends on how much salt you added to the tank, as I know you can add salt (tho in less doses I think than what would go into a normal fish tank).
Have you done regular weekly waterchanges since the salt was added?
If fungus occurs again, as Malachy says it might be better to do external salt baths (2-3 teaspoons of salt per litre/pint of water [an icecream container usually works] and no longer than 10=15mins as salt burns)
Also, have you tested your other water parameters - ammonia, nitrite and nitrate and what is tank temp? And does he have any other tankmates?
Gills can grow back.
(Message edited by kapo on October 01, 2006)
(Message edited by kapo on October 01, 2006)