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Or you could have a tank that has plenty of plants like mine at .5 watts per gallon. Obviously the 2 W per gallon rule does not always hold true.





The output spectrum of the light (thus the reason a 20watt flourescent is better than a 100watt incandesant), fertilization, duration of lighting, plant types, etc will all have an effect on your success in growing plants. If the watts per gallon rule was a reliable indicator of plant success my tank would be a barren wasteland.
 

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That would probably do it though I don't think you actually need the actinic blue lights in a freshwater tank. You might want to consider swapping them out for regular cf lights.
 
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