Length of salt treatment.

[bkthompson681]

I have searched the internet looking for a hard answer but can't find one.  I am doing a salt treatment of 1 tbsp per 2 gals in my 75 gel tank that had ich.   I am going on my 4th week at this dose and would like to do 1 more week before I start backing down.  How long can most fish tolerate this level of salt before they start to be harmed by it?   I don't want to go too long and kill fish.  Thanks. 

[Sapphere]

I know different fish will tolerate different levels.  I think you need to give a list of fish to get a good answer.