So i bought a powder blue tang about a month ago to take care of an algae problem i had. And he has been doing great, he ate all of the algae in the tank and i am now giving him sheets of nori as a supplement which he loves as well. And probably over the last week he has gotten little white spots all over him like he is fuzzy. And it almost seems to come and go. So i don't know if it would be ick or if it may be something else, but he is still eating great. Any help would be appreciated, thanks.