Spotex is a liquid water conditioner additive effective against white spots and other parasites in freshwater and saltwater fish. Add 1ml on day 1 and day 3 for every 40 liters.
Usage: Aerate the water well, keep feeding the fish, turn the ligths off, don't reduce the water too much, don't use active carbon and UV lamps and increase the water temperature 2-3 C°. In very severe cases the same amount could be used at the fifth and seventh days. At the end of day 7 and the day after that the water should be changed.