The Fritz ProAquatics Reef Pro Mix Complete Aquarium Sea Salt is a complete marine salt mix suitable for your reef or fish only system. It includes all of the essential major， minor and trace elements that your fishy friends need to survive. It reaches a stable pH quickly after it’s mixed， and is free of nitrates， phosphates， ammonia and other bad stuff. This sea salt is manufactured in small batches for fin-tastic quality control， so you can feel good about using it in your aquarium.