My understanding is that Ich is present in almost every tank etc. Fish exhibit the spots when Ich starts to multiply usually when fish are weakened through stress. If your fish has Ich showing you can give it temporary relief with a fresh water dip, add some buffer to some fresh water that is obviously dechlorinated and at the same temp as the tank. Put the fish in and watch it for any signs of stress, with the fresh water dip it shouldn't take to long for the Ich to start to fall off. Transfer the fish to a QT tank that's set up and ready to go and keep it a bit warmer than normal, lower salinity over a week and feed well but keep the water clean. Once the fish is adapted to the lower salinity keep it there for a week or two and then very slowly increase the salinity back to normal. IF you see any sign of Ich coming back decrease salinity again.
Doug
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