If you use standard hood light, it cannot reach the back corners effectively as light intensity dims at two ends and the back. Aquascapers use high light hang a foot or more above the tank so the light can disperse broadly. I use hood lights and supplement light to the dark corners by tying submerseable led tubes to back and side rims of my tank. You can find many submerseable leds for aquarium in EBay and Amazon.
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