There is nothing special about dealing with ich or to use the proper name cryptocaryon.
Prevention is important. Always maintain high quality water, and always quarantine new livestock for at least 3 weeks.
Stress is a factor. Moving a fish will stress it. Do your best to keep this to a minimum.
Treatment is by hyposalinity, gradually reducing the SG of the tank to about 1.012, over time. Use a refractometer. Aquarium grade hydrometers are not accurate.
Treatment can also be done using copper sulfate. This is more complex, and should not be used on fish that are sensitive to copper. Always use a test kit to measure the amount of copper in the treatment tank. I do not recommend the use of chelated copper compounds, as they can not easily be tested for, and are less effective.
In my opinion, using treatment like garlic, and shrimp or fish to control the disease is a complete waste of time, and the reports you get about people being successful with them are questionable. More likely is they got lucky.
Most important, never ever medicate your main display tank. I don't care what is written on the bottle or package, or what your LFS store tells you, no medication is "reef safe". Period.
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