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  1. #1
    Senior Member Leafster's Avatar
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    Oct 2003
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    How far above the water should MH bulbs be?

    I currently have my 250W 20K bulb 11" above my water. My tank is completely open as it is in my fish room with the front facing our rec room. Could I go as low as 6" ?

    Also, how long do ppl running MH keep their bulbs in for?

    My experience with MH is about three weeks...


    Thanks!
    Leafster

    Groceries or more reef supplies?
    What an easy decision...

  2. #2
    Senior Member Toooloud's Avatar
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    Nov 2003
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    1,191
    Depending on what is in your tank? Do you run the risk of fish splashing at the water surface? Myself i run my 175 watt halide 3 inches from the water line, Now that is concidered Risky.. But 6-8 inches is usally normal from what i have seen!

    Just gotta watch the heat issues and the worry of the bulb beeing splashed!.

    mike.

  3. #3
    Senior Member Leafster's Avatar
    Join Date
    Oct 2003
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    138
    Ya, I don't have that much movement on teh top. I think I'll gradually move it down to 6".

    Thanks Toooloud!
    Leafster

    Groceries or more reef supplies?
    What an easy decision...

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