API Stress Coat removes chlorine, chloramines and heavy metals to make tap water safe for fish. Contains Aloe Vera, which promotes healing and regeneration of damaged fish tissue and forms a synthetic slime coat to help prevent electrolyte loss. Proven to reduce fish stress, which can result from changing water, poor water quality and handling fish. High stress levels can cause fish to lose their slime coat and be more susceptible to disease. Stress Coat is proven to reduce fish stress by 40%.