Dual-Action disease prevention and life extension system. Probiotic bacterial strains protect against Ick, Ameromonas and other diseases. Life Maximizer with 17 anti-oxidants helps to insure cellular strength and boost natural disease immunity. Copper, chemical and drug free. Totally natural produce safe for use with all marine fish and invertebrates. Use 1 teaspoon per 20 gallons every 2 weeks.