API Marine Stress Coat, 16 OZAPI MARINE STRESS COAT water conditioner instantly removes chlorine, chloramines, and ammonia from tap water to make water safe for fish in your saltwater aquarium. This product promotes regeneration of damaged fish tissue through the healing power of Aloe Vera, and enhances your fishs natural slime coat to prevent electrolyte imbalance. API MARINE STRESS COAT water conditioner should be used when: Handling, netting, or adding fish to a bag for the