with freshwater its more about watts per gallon then the k value as i understand. I have on top of my planted angel, two t5 ho's that are 39 watts each. Just make sure you dont go super high on watts or youll need co2. As well what kind of plants are you having in your tank? red plants need higher light then say jave fern or moss. Good luck as well if you not running co2, pick up some flourish excel it has helped me out big time
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