I don't know if this is the article you were talking about. There is some good info about ICH by someone that has done some research on it.They do say that ICH can survive a long time...months..
I usually quarantine..unless I know the fish is healthy and eating.For me..using a good sized (25 gal) quarantine tank with live rock helps the fish get adjusted to your feeding schedule and foods...as well as seeing if they have any disease.I don't put any sand in. I can remove the rock for treatment if necessary.
If the fish is a finicky eater...it can help you find out what it will eat..you can observe it better and your other fish don't get all the food.
http://www.reefsanctuary.com/forums/...ths-facts.html