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Does anyone have any tips on cleaning white sand? I removed much deco's and plants so I can thoroughly clean my aquarium (the 75 gal) I have about 4 inches of sand all over, but on the top of the substrate in the center of my aquarium the sand has a yellow residue. I can't siphon it off without sucking up the sand with it. Would it be possible to just physically remove that portion, clean it and then place it back in?