Seachem Marine Trace Elements- Supplement for Fish and Marine Life in Saltwater Aquariums or Tanks REPLENISH: Replenishment of trace elements is required to maintain an environment ideal for the growth and reproduction of marine life and coral reef TRACE ELEMENTS: Marine Trace supplies a range of trace elements demonstrated to be necessary for proper fish health and growth SALTWATER: Marine Trace contains only those elements actually demonstrated to be required by and essential to marine fish SAFE: Marine Trace is safe to use in your saltwater aquarium and very easy to use. The addition of iron has been shown to benefit coloring and growth for corals, anemones, and other photosynthetic animals