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Probably going to get killed for this suggestion. But 1ml to every gallon of water of hydrogen peroxide will most likely rid you of that problem. I had a similar issue and used peroxide for a week or so and it helped like crazy. All of my sand was that color and most of my rock. Now none of my sand is that color and tiny parts on my rock have a little spot here and there. I dont like dosing anything to my tank but this did the trick and I see anything negative happen as a result.