Clown Fish have Ich how do I treat properly?

[SleepyPirate]

Its been another week and there has been no change good or bad. Although the white spots look like whiteheads, I haven't been able to quarantine Iv seen no change besides the fact that it hides much more during feeding time, although that Iv noticed in both of them they used to come to top of the tank and almost hand feed now they both hide in anemone most of the time only venturing out briefily to grab a flake thats passing by. Does anyone know how long it takes to generally kill a fish if it did have what was previously mentioned for a diagnosis.

Wonder if it could be stress? I had a tunez fan exposed to air for a long period of time while i was working which was incredibly loud and when I discovered it that same fish was PURE white and totaly spooked.