Well that sucks. What part of the county are you in, as someone mentioned before it may be region specific. I'm nw panhandle of Florida and just rinsed 2 bags for my daughters tank and it had no abnormalities. I've got 2.5-3 bags in my geo tank as well. No probs there.
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California. Here's a couple of pics I took. I found a lot of those in there. To me that's not good for geos especially if they're sifting through the sand.
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