Cichlid Trace™ supplies a broad range of elements demonstrated to be necessary for proper fish health and growth. Unlike terrestial animals, fish obtain nutrients from both their food and environment. Trace elements are normally depleted over time , so it is important to restore them on a regular basis. Cichlid Trace™ contains only those elements actually demonstrated to be required by fish. The formulation is based in large part on research done by the National Academy of Sciences. Aquarium Use Only! Keep Away from Children!