Calcium is one of the most important elements in a reef aquarium. Reef invertebrates, such as corals, crustaceans, molluscs, and even some species of encrusted algae, need calcium to grow...

API® 5-IN-1 Test Strips are a quick and easy way to test the 5 most important aquarium water parameters - pH, KH, GH, Nitrates, and Nitrite - in one easy...