Live Freshwater Fish - Light
LIGHT Light not only serves to provide visual pleasure and highlight the aquarium, it is also essential to its equilibrium, as fish, like most living beings, need the alternation of day and night, which acts as a biological clock. The action of light also makes it possible for plants to perform photosynthesis and grow. Marine invertebrates that play host to micro-algae (see page 169) require strong lighting. An aquarium must therefore be equipped with a light source which resembles as far as possible the one found in their natural habitat, as regards quantity and, most important, chromatic quality. Quality of the light Obviously, the best light would be that of the sun, which permits life on our planet. It is unfortunately impossible to take full advantage of it in an aquarium, for two main reasons. Firstly, it cannot be quantitatively dosed. This means that too much light often causes the growth of unwanted algae, and so it is important not to directly expose a tank to natural light, especially if it is facing south. On the other hand, if the direct influence is deficient, the aquarium does not receive enough light to ensure that the plants grow satisfactorily. Secondly, sunlight does not adequately highlight the aquarium and fish. It is therefore essential to resort to artificial lighting placed above the aquarium, usually in a hood specially designed for this purpose. This lighting must satisfy certain conditions, as regards: - the type of bulb used and the quality of the light produced; - the intensity of light supplied to the aquarium; - the duration of the lighting. You must be realistic as regards what you can achieve: no artificial light is going to be the same as sunlight. It is, however, possible to get close, ideally with a combination of different complementary light sources.
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