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Yay Green Water!

Discussion in 'Algae' started by Lafataa, Aug 7, 2011.

  1. Lafataa

    Lafataa New Member

    Joined:
    Jul 1, 2011
    Likes Received:
    0
    Location:
    MA
    Tank specs:
    55g
    Pressurized CO2
    4x54W T5 (Reduced to 2x54W T5 due to this current issue)
    1x Marineland 350 Double Biowheel and 1x Aqueon 55g Filter.

    About 70% planted or so with a couple Amanos (I had someone take care of the tank for a week and they killed all 10 Harlequin Rasboras :(). I plan to get about another 10 or so Amanos tomorrow (too many at once?) to bring the total to 12.

    PH ~8.4 (Tap water is 8.6 so I can't do anything about it).
    Nitrites: 0
    Ammonia: ~0
    Nitrates: 5.0

    Dose Flourish 2x a week and Flourish Iron 1x a week.

    Here's the issue:

    I recently had a HUGE algae bloom. The water was so green I could see maybe 2 inches from the glass. It looked like green Gatorade. I immediately did a 25% water change a day for 3 days and that didn't work. I did the blackout Method for 72 hours and it brought the algae to about 1/4 thickness as it was before. I stopped because my plants were starting to turn yellowish. I have the light reduced to about 6 hours with 2x 54W T5s. Is there any algaecide that is safe to use to give this a quick fix? Do I have to do the blackout again or should this go away on it's own? I reduced all direct sunlight on the tank which was what caused it before.

    Thanks
     
  2. Shadow

    Shadow Moderator Staff Member

    Joined:
    Aug 8, 2008
    Likes Received:
    228
    Location:
    Singapore
    Seems like you already know the cause, direct sunlight and too much light wattage. Unfortunately, once there it is difficult to remove.

    You can try UV sterilizer, work great with green water algae. If you do use UV sterilizer, pay attention on the flow spec. Higher flow will require higher UV wattage.
     
  3. Lafataa

    Lafataa New Member

    Joined:
    Jul 1, 2011
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    Location:
    MA
    What should I look at for UV sterilizers?
     
  4. Shadow

    Shadow Moderator Staff Member

    Joined:
    Aug 8, 2008
    Likes Received:
    228
    Location:
    Singapore
    The sterilizer packaging should mention the flow requirement.
     
  5. Jatbas

    Jatbas New Member

    Joined:
    Sep 29, 2011
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    Location:
    Portugal
    Just UV it... don't waste your time, just UV it, more CO2 and adjust your fertilization ;)
     

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