You are forgetting that water changes are also pertinent during the course. How much gallons you removed, dose salt at an exact amount. Oh for heaven's sake, I can't explain too well about it.:roll:Holly said:I see everywhere how much salt to put in the tank to treat ich but how ofter do you put it in? If you treat for 2 weeks, does one dose of a tablespoon per 5 gallons carry you through for 2 weeks?