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Basically the title. I have an 18" Ray 2 ds and a 24" planted plus on my 15 gallon aquarium. I want to know the spacing requirements to achieve the optimal amount of lighting in my tank. I built a 2" riser to put the lights on and the depth to the substrate is about 12". At present the lights are 5" apart from one another measured from their respective centers. Here are a couple of pics!
