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Re: [APD] Re: too much PO4 or not enough CO2?
--- Poe Lim <phlim at iinet_net.au> wrote:
> > Date: Wed, 03 Sep 2003 21:42:31 -0400
> > From: Thomas Barr <tcbiii at earthlink_net>
> > Subject: [APD] Re: too much PO4 or not enough CO2?
> > > These measurements taken in the evening about 3 days
> after 50%
> > > water change.
> > > - pH around 7.
> > > - Nitrates (NO3) at 13.6 ppm.
> > > - PO4 > 1ppm (my kit does not go higher than 1ppm)
> > > - CO2 is around 15ppm
> > Basic issue: CO2, CO2 and CO2.
> > Not enough. The rest will fall into place if you add
> more CO2 for the
> > light period(20-30ppm).
> > Time and time again, even the best of us get dogged by
> not checking this
> > not having enough.
> > Surface scum will even form faster/greater when less
> CO2 is present.
> > I've seen a correlation between these two for a number
> of years.
> > Not enough CO2= more surface protein/scums.
> > The plants likely leak this out in sub optimal
> conditions and/or the extra
> > CO2 drives photosynthesis faster creating more O2 that
> fries the
> > proteins/scum.
> Tom, my CO2 is at 30ppm, but I'm still getting bad
> surface scum; it's a
> definite layer on the surface which feels soapy. The
> plants seems to be
> producing O2 fine, with bubbles coming off. Low surface
> agitation to keep
> CO2 in. Any suggestions?
> phlim at iinet_net.au
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