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  1. Tue, 9th Feb 2010, 02:31 PM #1
    fs40reef
    fs40reef is offline Web Member
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    08-22-2009
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    Default What the...?

    I'm tearing down my tank today to drill for overflows and returns. While taking out the live rock I noticed a couple of pieces with these dark brown patches. These dark spots are only on rock in the back of the tank where no light reaches. Can anybody ID please? Whatever they are they scratch off with a finger nail. I just want to know if I should be concerned.
    Thanks,
    Will
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