I just did a water change today and it now looks like snow in my tank. I used the Petco salt as they were out of instant ocean. I mixed it overnight with a pump as my mixer in a 55 gallon drum. After the water change I didn't see any salt floating around and I am concerned that maybe this is ICH. Their are now white spots all over 2 of my fish. My question is, can a tank go from crystal clear to full of ICH in a couple of hours. And can a fish be engulfed in ICH in a couple hours or is it a slower process.