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520 Posts
i bought six bags for my 33long and my 75g and have not seen anything like this, yes oily residue i did have and it cleared up after two rinses i would take it back and show them the pieces that you are showing, for that would even damage a sand blasting cabinet, i have one so i know what it would do to it. and i use the stuff in my cabinet before i tried it in the fish tank.