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OK, I have already decided that more than 60% intensity is way too much for my 90 gal. I have my Hydras hanging about 8.5" above the water line and have now reduced my whites to 45%. At this level for white the purple glow is lessened and I have set up a reverse "bell curve" so to speak, with gradually increasing intensities on both ends of the spectrum, maxing out at 55% in the UV, purple and royal blues. Stared to notice that my mushrooms were not opening as much and the fish even seemed to want to stay in the shadows more. Too bad there isn't much in the way of guidance yet for the babies! Going on 1 week now and the tank is looking real nice.
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