ICH!!!! Help!

[foxface]

Well after 2 months of luck, diaster has finally hit me! One of my original clowns has ich all over, even on his eyes and fins. I have a quarantine tank set up for him and I'll try to catch him as soon as my daughter arrives in an hour. My question is, If one fish has it won't the rest get it too? If they all get it doesn't this mean that it's in the tank, if so how do I get rid of it? Even if they don't all catch it, Im worried it's in the water and when I put the little bugger back in a couple of weeks, won't it just all happen again, geez I'm so depressed . Where did it come from? Could it have come with a coral?
Louise

[Murfman]

Parasites like ICH are in your tank at all times. What bring it out in the fish is when they become stressed by some outside factor. It could be your water perameters, another fish picking on it etc. Treat the fish in a QT tank and maybe run ozone or a UV sterilzer for a week or so to kill the living parasites.