Noticed these white spots on my tang this evening, it is on both body and fins, no other fish affected in tank, I suspect it is white spot and wonder what is best treatment, tank is FOWLR, I would sooner treat the whole tank rather than Quarantine 1 fish, tank has 2 clownfish, 1 royal gramma, 1 yellow wrasse, 1 cleaner shrimp and 1 conch snail.