Reduce fish stress and help to heal damaged tissue with API Stress Coat with Pump Aquarium Water Conditioner. Chlorine and chloramines in tap water can damage to fish tissue and breathing difficulties. This water conditioner works to reduce fish stress up to 40% by working to remove harmful chemicals and make tap water safe. It contains soothing aloe vera， which is scientifically tested to reduce fish stress， helps to heal damaged tissue and promotes regeneration of tissue. It forms a synthetic slime coating that replaces the natural secretion of slime to help reduce susceptibility to disease. Use when starting a new aquarium， adding or changing water and adding fish.