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Regular cyclical lighting is used in aquariums to simulate day and night. This is beneficial for fish and invertebrates since it establishes a routine, enables them to rest, and makes them feel more secure. The lighting used varies depending on the inhabitants of the aquarium. Typically, the type of lighting for aquariums with fish only is regarded as unimportant. In aquariums containing invertebrates, however, where algal growth (of both free-living and symbiotic algae) is desired, more intense lighting is required. geovani link building