The importance of trace elements.
By trace elements we usually mean elements that are present in natural seawater in a concentration lower than approx. 1 mg/L or ppm. Some of these elements are essential to make many biological processes possible. Manganese for instance is essential for photosynthesis and many biochemical reactions associated with it. Some organisms require iron to absorb essential nutrients. Cobalt is essential for the formation of several coral pigments. Zinc is, like manganese essential for photosynthesis and is also essential for the formation of calcium carbonate by corals. These are just a few examples.
About Trace Hard
The largest difference between trace element usage is between hard corals and soft/leather corals and coralline algae. Salifert have therefore designed a trace element mix for hard corals (Trace Hard™) and one for soft/leather corals and coralline algae (Trace Soft™). Both can be combined according to the approximate ratio of the aquarium inhabitants. In this way a very close to perfect formulation of trace elements for different aquariums have become available.