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In my experience once they adapt to your tank you can keep it in high or lower light. I bought a softball size purple polyp green birdnest and it was under a 6 bulb T5 with reefbrite strips when put in my tank under my LED it bleached... I lowered my alk 9.3 to 8 and put it on the sand it now glows like its under antinic light all day. I would lower your phosphate nice n slow and make sure you also have some nitrate or it will never get nice n dark colored. Keep them balenced
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