by 
The Curious Bag
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<h4 class="dechead">On One Hand: Some Light Is Necessary
Light plays an important role in an aquarium. Insufficient light can lead to fish stress, poor fish health and lack of coloration. The goal of aquarium lighting is to imitate the light fish receive in natural settings so that they can function normally. Consistent light and dark cycles will help your fish live in a healthy and happy routine.
On the Other: Too Much Light Is Bad
Excessive lighting is not only expensive, but will likely cause algae growth. Also, too much lighting will disrupt the natural rhythms of your fish, which can be as harmful as not having enough light. Excessive lighting can also cause faster water evaporation and higher water temperature.
Bottom Line
How much light your aquarium needs depends on several factors, including the species of fish and plants, the size of your tank and the growth rate you wish. Cycles of six to 12 hours will be adequate for many fish-only aquariums. You can invest in a light timer to time your aquarium light cycles precisely and effortlessly.
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