What is This Black Spot on My Rock?

Discussion in 'Live Rock' started by Kodak, Jan 2, 2013.

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  1. Kodak

    Kodak Astrea Snail

    Joined:
    Sep 15, 2012
    Messages:
    53
    Location:
    Bolingbrook, IL
    Can anyone identify this black spot? It's on my tonga branch rock. The rock was purchased dry from BRS. My tank just completed cycling.

    ammonia 0
    nitrite 0
    nitrate 5
    pH 8.0
     

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  3. SyntheticBreed

    SyntheticBreed Feather Duster

    Joined:
    Jul 12, 2012
    Messages:
    213
    I recommend you repost this in the ID this section of these forums. I honestly do not know what the spot is.
     
  4. Greg@LionfishLair

    Greg@LionfishLair 3reef Sponsor

    Joined:
    Oct 17, 2011
    Messages:
    1,095
    Location:
    Coastal So. CA
    Looks like it's likely a little spot of black cyanobacteria. Since your tank is new, it's still pretty unstable, and you'll likely see a few algae cycles come and go.