The Marine Stress Coat by API instantly removes chlorine and chloramines, making everyday tap water safe for fish. The Stress coat will neutralize heavy metals and replace the natural slime coating fish need in times of stress, such as handling, shipping, or fighting. Marine Stress Coat contains Aloe Vera to prevent the loss of essential electrolytes and protect damaged tissue against disease causing organisms. It can help heal torn fins and skin wounds. Use this product when setting up a new aquarium, changing water, or adding fish. Aquarium Pharmaceuticals Marine Stress Coat: 16 oz #385D - Water Conditioners