Did this fish look like this when you got it? I can't tell from the photo. Does the white look like grains of salt? Normally ick starts on the fins. I can't tell if there are any dots on the fins. edited to add: A closer look shows me that it is on the fins.
If it didn't look like this at the store and if it is in fact ick then your tank is badly infested and immediate action is needed to save not only this fish but everyone else in the tank with it.