Yes, every one of my fish has something diferent. Yellow tang has a black dots, Blue hippo tang has black dots and white cotton like things on his body (as i understand this is fungus). The rest of fish has white spots like snow flakes. As i understood it't kind of fungus as well. My problem to use medicatuon is because my tank contains inverts: anemones, crabs, shrimps, worms. My local store dealer gave me this STOP PARASITES for free just to test it, because it's something new in Israel.