If your poor fish has Ich, also known as White Spot Disease, then this product is a must have. Keep in mind, Ich is a highly contagious disease, so the the quicker you treat your fish, the better, and this selection is highly effective.
In fact, this medication will quickly kill the Ich parasite within the first 24 hours (usually). How it works is it provides the fish with a synthetic slime coat replacement, which in turn will provide the fish with a barrier to fight against and protect against a secondary infection.
The medicine comes in a 4oz bottle, and it can treat 118 gallons of freshwater only.