Calcium is the primary building block of corals, clams, calcareous algae and many other organisms that we grow in our aquarium. Without adequate supplies of calcium these organism will not flourish and will eventually waste away and die.
The ideal value of calcium for a marine aquarium is between 380-450 mg/Lt (ppm) and for planted freshwater aquarium 100 mg/Lt (ppm). Because of the importance of calcium it is necessary to keep the proper calcium level inside our marine aquariums by testing it with an accurate test kit.
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