Re: [APD] CO2, water changes gas phase Vol1

["Liz Wilhite" <satirica at gmail_com>]

On 1/26/07, Liz Wilhite <satirica at gmail_com> wrote:
>
> That is meaningless.  If the pearling is due to water change alone you'd
> expect to see twice more pearling from an 80% change than from a 60%
> change.  You are comparing apples and oranges.


Oops, that twice is a "mentalo" leftover from reworking two thoughts.

To find out if the pearling is due to exposure to air, drain off the tank
> water, expose the plants to air, and add the same tank water back in.  That
> will at least suggest air exposure has something to do with, but will not
> confirm it, and certainly will not confirm that CO2 gas had anything to do
> with it.
>
> Jerry is dead on that there are multiple variables unaccounted for, and no
> control.
>
> My tanks pearl like crazy after a water change, even when they contain no
> plants.
>
>
> On 1/26/07, Thomas Barr <tcbiii at yahoo_com> wrote:
> >
> > > Not 100% convinced.
> > > Try the same experiment again. But this time leave the level
> > > of water in the
> > > tank just above the leaves for 5 mins so they're not exposed
> > > to the air?
> >
> > I've done this.
> > I call it a 60% water change vs an 80% water change:-)
> > There is a huge difference.
> >
> > > That way the only change would have been the exposure to the
> > > air and not
> > > just the addition of new water.
> > >
> > > Observe the difference this may or may not make?
> > >
> > > --
> > > Stuart Halliday
> > > http://theaquariumwiki.com/
> >
> > We don't see the same pearling, nor the same O2 levels
> > afterwards.
> >
> > Regards,
> > Tom Barr
> >
> > www.BarrReport.com
> > www.sfbaaps.org
> > www.gregwatson.com
> >
> >
> >
> >
> >
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>
>
>
> --
> Liz




-- 
Liz
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