In your pic, I can see what may be a single white dot but I can not tell if its just a spot/scrape on the scale or may be the start of ich. I do not see anything else. Does he have the classic white spots (like grains of salt or sand) anywhere on his body? Its usually most obvious on the fins or tail and would be more apparent on a black fish. How do your water parameters look (ammonia, nitrite, nitrate & ph)?