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Re: [APD] CO2 mist and the persistence of the micro bubble

I talked with a marine tank representative and he told me that a venturi 
would give thick bubbles in this case, not the type we see in marine water. 
What will happen in fresh water with CO2?.


>From: Raj <ggrk at blr_vsnl.net.in>
>Reply-To: aquatic plants digest <aquatic-plants at actwin_com>
>To: aquatic plants digest <aquatic-plants at actwin_com>
>Subject: Re: [APD] CO2 mist and the persistence of the micro bubble
>Date: Sun, 02 Oct 2005 20:37:34 +0530
> >  So in the AM when the lights first come on, the CO2 is poor and the gas
> > rapidly dissolves entirely.
> >
>          This would be incorrect unless pH controller is used to shut of
>CO2 above a certain pH. Even than the plants would be a contributor to CO2
>at night time.
>          I observe in my CO2 injected tank that the pH drop overnight
>(Measured at Sunrise - i.e. Lights ON) to 6.6 from a level of ~7.0 at
>Sunset (lights off). So the water is at its highest in CO2 at Sunrise. I do
>not use a controller. I propose the use an aerator to reduce the CO2 levels
>at night with a pH controller and at the same time keep the O2 levels up
>than just shut of the CO2.
>          FYI My KH is 5-6 at this time - A professional lab says 90 ppm I
>test as 110 ppm. The dissolved O2 at sunset is >8 and at sunrise is <2 mg/L
>(fish are breathing rapidly). The lights are 3W/US gallon of PPL and
>tubelights of various mix. The pH meters (WTW pH95 and a Hanna Checker) is
>checked for calibration everyday. O2 meter calibrated to Atmosphere before
>every reading.
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>Aquatic-Plants at actwin_com

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