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Thread: Question on WPG

  1. #1
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    Question on WPG

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    Hi,

    Can someone tell me whether the term wpg (watt per gallon) refer to UK gallon or US gallon?

    Example when one says 1.5wpg for a low light low tech tank, does one refer to 1.5 watt per US gallon or 1.2 watt per UK gallon?

    1 UK gallon ~= 1.2 US gallon ~= 4.59litres ?

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    Re: Question on WPG

    it is in us gallon.
    anyway, the wpg "rule" should be used as a guide only.
    thomas liew

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    Re: Question on WPG

    WPG does not scale well for very small tank or very big tank.
    -Robert
    Aquascaping is a marriage between Art and Farming
    My Blog: http://aquatic-art.blogspot.com/

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    Re: Question on WPG

    Hi Thomas,
    Thanks for the clarification.

    Hi Shadow,
    I have placed order for a 6x2x2 tank and am planning for a non CO2 low light low tech tank.

    Can you advise if the WPG rule will work for my tank. If not, how much wattage should I be looking at and how many hours of light per day ?

    Thanks much for your advice in advance.

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    Re: Question on WPG

    6x2x2ft, that huge. Never try this kind of size before, so I can't really give you any advice especially when you want it to be non CO2.
    -Robert
    Aquascaping is a marriage between Art and Farming
    My Blog: http://aquatic-art.blogspot.com/

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    Re: Question on WPG

    Hi Robert,

    I found this link recommending lumens/square inch and then from there determine how much wattage is required. The one problem is that it does not have a table for T5s.

    http://woo.gotdns.com/Aquarium/Lighting.htm

    It does recommend about 117W for T8 for low light.

    I'd like your comments. Do you think i can also reference about 117w for T5s for low light?

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    Re: Question on WPG

    Quote Originally Posted by mgsim View Post
    Hi Thomas,
    Thanks for the clarification.

    Hi Shadow,
    I have placed order for a 6x2x2 tank and am planning for a non CO2 low light low tech tank.

    Can you advise if the WPG rule will work for my tank. If not, how much wattage should I be looking at and how many hours of light per day ?

    Thanks much for your advice in advance.
    I had a 6x2x2. 2WPG was more or less highlight for the taller plants. For a non CO2 low light low tech tank, I would suggest 1.5 to 1 WPG... though at 1WPG, the short plants will have to be the really shade loving plants like Anubias. 12 hours per day of light will do.

    I would still suggest adding carbon either in the form of CO2 or a liquid supplement like Seachem Excel or the one from Profito or other equivalent. It does make a difference in my opinion. Be careful if you are injecting CO2... don't over do it and a solenoid is a really good idea. Personally, I'll just go with the liquid supplement, as there is no worry of CO2 poisoning and it's harder to overdose.

    For such a large tank at low tech, circulation is important to make sure there are no stagnant areas where algae will usually thrive.
    Vincent - AQ is for everyone, but not for 'u' and 'mi'.
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    A woman, without her man, is nothing.
    A woman: without her, man is nothing.

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    Re: Question on WPG

    Tom Barr has a 6ft setup which is also 2WPG which you can use that as a guideline. With CO2 of course.

    http://www.aquaticquotient.com/forum...ad.php?t=65178

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    Re: Question on WPG

    so without CO2 should be lower then, maybe 1 WPG?

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