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  1. matt

    Oily surface film

    Afternoon all, I have an 100l open top tank which has suddenly developed an oily surface film overnight, was fine yesterday. It's lowtech and I'm not dosing EI,but recently(5 days ago)added KNO3 because my Limnobium laevigatum was looking very yellow and falling apart,would adding the KNO3 be...
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