white film in tank

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    What Is This White Film On The Glass And Tubes When Cycling Is Complet

    So I was at my friends today and he feels his tank is nearly done cycling. He was going to do a water test later to be sure (wife was picking up kit on her way home). We were both wondering what the white, milky film was all over his glass and air hoses. He has also started to get some brown...
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