API® STRESS COAT water conditioner makes tap water safe for fish by removing chlorine, chloramines and heavy metals from tap water, and contains Aloe Vera to rejuvenate and protect fish's skin. API STRESS COAT water conditioner also reduces electrolyte loss in your fish, and should be used when: Handling, netting, or adding fish to a bag for the trip home from the store, Starting an aquarium, Performing monthly water changes, When adding new fish to your aquarium. Our unique formula is scientifically proven to protect fish's skin. STRESS COAT water conditioner also helps reduce fish susceptibility to disease and infection.