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  1. #1
    Senior Member colesy's Avatar
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    Brown Algae on Base Rock?

    Hey there. I am in the process of cycling a new tank. I have put just a small peice of live rock, and a small peice of base rock in the tank about a week into the cycle.

    I noticed within days of putting the base rock it started turning brown. I don't know if this is good or not. I took a pic that shows it pretty well. Click the image to get a bigger pic.


    If anyone can identify this, and let me know if its something I should worry about or not. Thanks again!

  2. #2
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    Looks like diatoms. It is a normal part of the cycle. It will probably go away when the green algaes start growing.

  3. #3
    Senior Member colesy's Avatar
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    Ok thanks! There is a small amount of green algae already growing.. Is the green algae ok?

  4. #4
    Senior Member Ricepicker's Avatar
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    yea man, we like green...

    diatoms are honestly not bad though... a sure sign that ur tank can support life.

    then again those things can grow by volcanic vents...

  5. #5
    Senior Member colesy's Avatar
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    Ok, I was just a little confused, as I was just reading another thread where the person was posting that he was happy to see very little green algae.. Thanks for the info!

  6. #6
    Senior Member Ricepicker's Avatar
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    Brown < Red (slime) < Green < Green (macro) < Red (coralline/macro) < Purple/pink (coralline)

    thats a pretty good rule of thumb when it comes to algae i suppose...
    the less it looks like stuff out of ur bum, the better

  7. #7
    Senior Member colesy's Avatar
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    Quote Originally Posted by Ricepicker
    Brown < Red (slime) < Green < Green (macro) < Red (coralline/macro) < Purple/pink (coralline)

    thats a pretty good rule of thumb when it comes to algae i suppose...
    the less it looks like stuff out of ur bum, the better
    So are you saying that is the order from worst to best? Is any of it bad for a tank?

  8. #8
    Senior Member Ricepicker's Avatar
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    nothing is "bad" really.. brown and red slime algae usually a sign that the nutrients in the water is too high, usually Phosphates and Nitrates.

  9. #9
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    Diatoms are pretty much at the bottom of the algea chain. The green forms are more complex. Any of them can be a real problem if nutrients are too high. Keep doing water changes and all the other good stuff. You will be fine.

  10. #10
    Senior Member colesy's Avatar
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    Ok. Since i am just cycling the tank. How far into the cycle should I do my first water change? and how much?

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