Hard Corals

Hard corals need some special attention for long-term success, as they take calcium carbonate from the aquarium water to build the hard, calcareous skeleton, which houses the living polyps. Depleted elements must, therefore, be added back to the water as they are absorbed. The intense and broad spectrum lighting requirements are generally the same as recommended for the anemones, in order to permit the growth of zooxanthellae in the tissues of many species. Hard corals are more difficult to keep than soft corals, as a general rule, and best avoided by the beginner.