This is extremely important, both as regards quantity and quality. Apart from the aesthetic effect, lighting serves to enhance the development of Zooxanthel-lae, the micro-algae which live in the animals' tissues and contribute to their equilibrium.

If the water is less than 50 cm deep, use fluorescent tubes as day lighting, in conjunction with a blue tube. Deeper water requires powerful HQI lamps, again combined with a blue tube. The lighting must be strong (around 1 W per liter of water) and should be left on for about 13 hours every day. UV lamps are not recommended for invertebrates. More detailed information on lighting can be found in the chapter Equipment and Accessories (page 226).

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