Ich should not be a major problem in this day and age. The best treatment is still hypo salinity, reduce the SG to about 1.012 over several days, and maintain it there for about two weeks. Then raise your SG back to normal over several days. You may have to remove the inverts, but many can take a low SG.
It is much less stressful than any other treatment, and it costs you little.
You kind of answereed your own question. Get a QT tank. A reef system should never ever be medicated. Yes it will cost you a few $'s, but it's cheep compared to a total fish loss.
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