API Stress Coat water conditioner makes tap water safe for fish by removing chlorine, chloramines and heavy metals. It contains Aloe Vera to reduce fish stress by up to 40% and to heal damaged tissue and wounds. Treat your tap water and provide a safe environment for freshwater fish instantly and easily. Tap water contains chlorine, chloramines and ammonia which can cause gill and tissue damage, breathing difficulty, stress and death. This water conditioner works instantly to remove chlorine and chloramines from tap water and neutralize heavy metals. It is good for both freshwater and saltwater aquariums. It also removes toxic ammonia, nitrites, and nitrates to restore a healthy aquatic environment when test results show high levels of ammonia. With API Aquarium products, it's easy to keep a beautiful saltwater, freshwater or reef aquarium. It is the world's top-selling water conditioner containing Aloe Vera, nature's liquid bandage, to protect and heal fish. It forms a synthetic slime coating on the fish and replaces the natural slime that is disrupted by handling, shipping, and other forms of stress. It helps to reduce susceptibility to disease and infection, heals torn fins and skin wounds, and reduces electrolyte loss. Can be used when performing a partial water change, starting a new aquarium, and adding new fish.