Help keep your aquarium water healthy and your pets and plants thriving with the API Calcium Saltwater Aquarium Test Kit! Testing your water's calcium levels regularly is important because it helps prevent invisible water problems that can be harmful to your underwater buddies. 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.
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