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Results 1 to 4 of 4
  1. #1

    Join Date
    Apr 2009
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    Default Algae Bloom while trying to cycle tank


    0 Not allowed!
    I'm trying to cycle a 40 gal planted aquarium with 4 Zebra Danio's. It's been four weeks now (three with fish) and I still have no nitrites. I have a algae bloom that has plagued my tank for the last 3 week as well. I'm also doing CO2 injection to encourage plant growth. I even have added some floating plants; Frogbit, Hornwort and duckweed in a attempt to absorb the nutrients and starve off algae. I have also been leaving my lights off, In the beginning I ran them for 8 hours a day with a 2 hour siesta. the green water lightens after about a week with no lights, but never disappears. As soon as the lights are on for a few hours the water become greener. I did a 25% water change (DI) last week and all my levels remain unchanged.

    Ammonia: .50ppm
    Nitrites: 0ppm
    Nitrates 0ppm
    PH: 7.0
    KH: 11
    GH: 5
    CO2: 33ppm

    Any suggestions or insight would be greatly appreciated, More water changes?

  2. #2

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  3. #3

    Join Date
    Aug 2007
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    0 Not allowed!
    Where is your tank sited? You'll have green algae problems, both floating and sessile, forever, if your tank is anywhere near a window. Even indirect sunlight can cause the floating algae bloom.

    I know it's counter-intuitive, but if you left the lights on throughout, the plants would have used up the over abundance of nutrients a new tank like yours almost always experience. Vascular plants always out compete algae for nutrients given a chance to do so.

    Your Co2 level is a tad high. Back it off to 30 ppm.

    Dave

  4. #4

    Join Date
    Apr 2009
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    0 Not allowed!
    My aquarium is not by the window and its in a room that has has the blinds drawn.

    I guess I'll return to having the lights on and ride it through.

    Thanks

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