In my experience, ich kills.
I've got clown loaches in my tank (sensitive to some meds), and cories, who don't handle salt well at all. I've also got plants. So ...
The best thing I've ever found for ich is Jungle's Ich Guard (the granules--not the liquid Ich Guard II, which does not work).
Treatment: take out the carbon, do not change the tank temperature, and do not add salt. Dose with the Ich Guard at half strength.
Wait 24 hours. If ...
... you still see ich on the fish, do a water change and dose again, at half strength. Do nothing for four or five days. Ich will be gone.
... you don't see ich on the fish, leave everything alone for four or five days. Ich gone.
Works for me every time, and I've tried lots of methods before finding this one. It also doesn't harm my fish.
-- Pat