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ferrous

  1. jaypeecee

    Does Ferrous Gluconate Cause A Water Surface Film?

    Hi Folks, Whenever I use Seachem Flourish 'Comprehensive' or Flourish Iron, an oily film develops on the surface of the water. Both these products contain ferrous gluconate. Is it reasonable to conclude that ferrous gluconate may be causing the surface film that I am seeing? I will add that...
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