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It is definitely NOT recommended to medicate a reef tank for fish diseases. Are you sure it's Ich? How long have you had the fish and are either a new introduction? I'm assuming you did no QT before fish intro into the main tank. Any chance of pics, although the behavior definitely sounds like you have a disease. Could be Ich, Velvet or Brooklynella.
Last fish added was a sailfin, whom the LFS said had dots on it due to stress (another long story) fish died within 24 hours. That was last Sunday. This morning noticed white dots on my two-spot damsel and then watched my hippo tang scratch herself like mad person on the rocks in between eating. Clowns (2 maroon), coral beauty, rusty angel and six line wrasse all are in great shape. LFS no help, all they said was we gave you your money back on the sailfin! Oh, and every tank crashed at some point, part of the hobby. I can get pics this evening - assuming I have not lost any fish.
Another indictment of the local fish store. Difficult to find an ethical store.
You've learned the importance of a quarantine tank the same way that most of us have; by not having one. This being said, you can only move forward, learning from the mistakes.
You mentioned that the tank has been up and running since July, and that fish have been in the tank since August. You have added 7 fish in 6 weeks. That is more than 1 fish per week... IMO far too many in such a short period of time. Would it be correct to say that they were all added at the same time?
Adding fish too fast will cause an ammonia spike because the colony of nitrifying bacteria in the tank is too small to handle the bio load created by adding so many fish in a short period of time. This spike in ammonia will be stressful to fish at least and will cause gill burn.

