[Amazon]

Is it a planted tank? From what I understand that eliminates the salt option.

About two months ago I added some new fish - didn't QT. Then saw one with ich. A fair number of spots, but just one fish. I was researching, weighing the options (I keep SW and the ich treatments are different). I decided I was going to increase the temp. But at the same time I was also watching for signs of it spreading, too. It didn't. (I run UV and had just changed the bulb) So in the end I just kept the water quality good, fed well, and to date there are no signs of it. I know it's in there, and it probably always has been. But no issues so far.

So maybe if you're in a position to add UV to your tank it will help knock it down and they'll all fight it off. For me it seemed to be a less stressfull experience for the fish (and me).