Calcium is one of the most important elements in a reef aquarium.Reef invertebrates such as corals, crustaceans, mollusks and even some types of encrusting algae need calcium to grow and remain healthy.
For Freshwater : General (GH) & Carbonate (KH) HardnessThe general hardness (GH) and carbonate hardness (KH) of aquarium water should match that of the natural habitat of the fish. Otherwise, fish will be stressed and prone to disease.
For Freshwater & Saltwater : Carbonate HardnessThe carbonate hardness (KH) of aquarium water should be tested frequently, since water with a low KH is subject to rapid shifts in pH, greatly stressing fish and making them vunerable to disease.
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