Does it look like someone sprinkled salt all over your fish? If so, your fish has Ich, and real salt is a great medication. Just add about 1.5 tsp per gallon (plain old table salt is fine, doesn't have to be Kosher or anything), and raise the temperature up to about 80 degrees.
-Josh
P.S. Dont' worry about your pH, unless you start playing with it, pH will never hurt your fish.