Originally Posted by The Bunk
I made my frist major mistake in reef tanks a few weeks ago, and became the poster boy for QT tanks. I bought a fish that had ich (unbeknownst to me) and put him directly in my tank. Within two weeks all but two fish in my tank were dead. I'm fighting an uphill battle to save the last two I'm afraid. I won't be buying another fish until I get my QT tank setup.
What kind of tank do you have? If you don't have quarantine available, Kordon Herbal Ich Attack is a very good product. No copper (actually contains Napthoquinones) and safe for all invertebrates. It's worked will for me in the rare case a new fish brings in Ich.