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I know this too well in my own tank, except it extends itself to pinks, reds, and purples. And it's definitely the lights. I have AI's as well, and they do not hit the red spectrum well. If all other colors are doing well, then it most likely is lights. If you can throw some T5 supplements in there or some red, violet LEDS. I think it will make a large difference. I had a pink Mille under my AI's that was brown. Under my T5 frag tank with ATI blue plus and Fiji purple it was a nice light pink with yellow tips! Lighting can make a huge difference! Just my thought process, someone else will certainly jump in too.
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