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  1. #1
    Senior Member
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    how much evaporation

    40g tank long
    4x65w

    how much do you think i will have to top off?

  2. #2
    Member Dave83's Avatar
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    Mar 2005
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    It will depend on a couple things, Is the top of the tank open or covered? Is there a fan in the canopy?

  3. #3
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    with top, with fan

  4. #4
    Senior Member Nobez's Avatar
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    Over what length of time?

  5. #5
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    12h ))))

  6. #6
    Senior Member Nobez's Avatar
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    Oct 2005
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    I would not think that much, what type of lighting is it?

    With 4 T5's on a 48" 55gal, my top off only comes on every other day at the most.

  7. #7
    Senior Member
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    it would be 48" Orbit PC / Lunar Lights 4-65W/4-Moon (Current)

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