What is this?

Discussion in 'Algae' started by Blazy, Sep 9, 2019 at 1:46 AM.

  1. Blazy

    Blazy

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    I treated my tank with chemiclean but this doesn't go away. It seems like cyno but I guess it's not. Anyone please advise. Thanks
     

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    Blazy, Sep 9, 2019 at 1:46 AM
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  2. Blazy

    Blazy

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    Also comes off the Rocks easily
     
    Blazy, Sep 9, 2019 at 1:46 AM
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