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Aquarium Lighting
Aquarium lighting is one of the most important pieces of equipment in a reef aquarium, or any aquarium. Proper aquarium lighting intensity is required for your corals and invertebrates to survive.
Similarly, aquarium lighting for plants, corals and many invertebrates require light for photosynthesis to generate energy. If your corals and invertebrates do not receive enough light for photosynthesis, they will not survive. Suitable aquarium lighting also positively effects coloration of fish and reproduction. Lighting the aquarium at 2.5 watts per gallon for several hours each day is an useful guideline to keep in mind.
Generally, the VHO (Very High Output) fluorescent and PC (Power Compact) fluorescent lighting systems are great for corals that require low to moderate lighting, such as leather corals, mushrooms, polyps, and LPS corals. The Metal Halide systems are great for corals that require intense lighting. SPS corals, clams, and anemones would best survive in a system with metal bulbs. Many hobbyists will supplement metal halide lights with VHO (or PC) lights to simulate a dusk/dawn effect and to add more blue coloration to the tank.
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