Im thinking it is ick, not sure as I have never had it before. Overnight my powder blue tangs head(black part) is covered in white dots looking like salt so I am thinking it is ick. Not another fish in the tank has it. What plan of action should I take? I just got home now so there i am guessing there is no much I can do now. Only products I have are from my koi pond which is Prazi and profrom c...