Dark stuff on my new rocks

Discussion in 'General Reef Topics' started by Kodak, Nov 19, 2012.

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  1. Kodak

    Kodak Astrea Snail

    Joined:
    Sep 15, 2012
    Messages:
    53
    Location:
    Bolingbrook, IL
    I received my Reef Saver rock from BRS and overall I'm very pleased with it. However, there are a few pieces that have dark areas on it (see pics). I rinsed it several times with a garden hose, but looks like the only way to clean it is to scrub it. And even that might not work. Does anyone know what this is? If I can't get it clean will it harm my tank? The rock will be used in a new tank build. Thanks!
     

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    Kodak, Nov 19, 2012
    Kodak, Nov 19, 2012
    #1

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  2. rc_mcwaters3

    rc_mcwaters3 Clown Trigger

    Joined:
    Dec 18, 2010
    Messages:
    2,036
    Location:
    Valdosta, Ga
    if you are sysling the tank or if the tank is fairly new then it is algea using the silicate in the rock and will go away after the silicate is used up.
     
    rc_mcwaters3, Nov 19, 2012
    rc_mcwaters3, Nov 19, 2012
    #2
  3. Kodak

    Kodak Astrea Snail

    Joined:
    Sep 15, 2012
    Messages:
    53
    Location:
    Bolingbrook, IL

    It's new rock. Not cycling yet.
     
    Kodak, Nov 19, 2012
    Kodak, Nov 19, 2012
    #3