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If the light is from screw-in CFL "power saver" bulbs, you don't have as much light as the "watts per gallon" would make you think you have. Those bulbs are very inefficient at getting light down into the water. If you are using them, you probably still have a low light tank, and little fertilizer dosing is needed.

But, if you retrofitted a PC light, the 4 pin type, with two parallel tubes, and are using a good reflector, you may have moderate light intensity. The tank depth tends to reduce the effective intensity. For this type of lighting, some dosing of NPK and trace elements would be desirable.
 
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