API MARINE COMPLETE TRACE Aquarium Water Conditioner 16-Ounce Bottle Contains one (1) API MARINE COMPLETE TRACE Aquarium Water Conditioner 16-Ounce Bottle Adds key trace elements plus iodine and restores all trace elements found in sea wate All natural solution maintains proper water conditions in aquariums containing hard and soft corals. Use to replenish the trace element balance in marine and reef aquariums. For use in all marine aquariums, including reef aquariums containing hard and soft corals, live rock, coralline algae, crustaceans, starfish, and saltwater fish.