Renrub, I remember you posted lately about your plants dying in your newly setup tank? Getting more light is not the solution as your current amount of light 45W in total is enough for a standard 2 ft (2ft X 1ft X 1ft?) tank. Look at the CO2(get it within 20-30ppm range during lights on period is critical), NO3(5-10ppm)<with test kit or estimative method but when using estimative method, best with low bioload as it lessen the chance of interference, K(20-30ppm)<Dose estimatively using chuck gadd's calculator, traces(3.5ml 2-3X a week would do for your tank) and finally PO4(0.5-2ppm)< tested with test kit or dosed estimatively.
Amount of light is easy to control...CO2 and NO3 are the two biggest problems if things go bad. Too much or too little CO2 is no good..NO3, best kept on the low side or just enough as high NO3 can destablized tanks and cause algae outbreaks.
Plant Physiology by Taiz and Zeiger
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