As a result of my recent move, I am treating my tank for Ich. Salt and Heat method. 10 days after the move I noticed that 2 of my fish had some Ich, so I immediatly started treating. It wasn't a very bad case(visibly). The visable signs were gone after 4 days, but I still see my one fish flashing, Tomorrow will be 2 weeks since I started treatment. Salt concentration is 2tsp/per gallon and temp is at 83. How much longer should I continue treatment?