If it were possible to collect daylight, and by some method store and control it in the same manner as we can with electricity, we would have the perfect lighting.
Getting That Perfect Aquarium Lighting
When you choose a position for your aquarium , try to place it so that it will get its fair share of daylight. The light should be diffused, and the tank should receive at least two hours of direct sun each day, which is a minimum if plants are to function properly.
If too strong a light penetrates the tank, it will cause the excessive growth of algae, which takes the form of cloudy green water, mossy growth on the plants, or a green film on the glass, and sometimes a combination of all three. If you have to use very raw water, the actual surface will become coated.
You can control this by shading the aquarium with newspaper, green tinted Cellophane, or by painting the glass sides with a green paint. The shading or cutting down of the light should be treated with caution.
It is better to have too much light than not enough. Algae is not harmful to fish, but just the opposite. Plants cannot give off oxygen unless they are stimulated by light. But if you can arrange your tank in a position where it will get just the right amount of light, so much the better. There is no formula for this. You obtain the best results by trial and error, and all that is basically required is a little patience.
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