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Anaerobic areas in tank

Whenever I put "plant tabs" in my substrate , I place them all on my algae
 cleaning magnets for safe keeping while I prepare a site . They stick just
like any iron object would to a magnet , tho a bit weaker , the effect is
the same .
                        DT Wilmington , Ohio
    > From: "Roger S. Miller"
>Correct me if I'm wrong, but isn't micronized iron just very
  >fine iron filings?