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Re: [APD] aeration & a planted tank
Hmm. It's not jsut principles, it's also the numbers.
Plants have a net uptake of O2 at night so the O2 level
will therefore be lower at night, other things being equal.
However, even without CO2 injection, a heavily planted
aquarium can (mind you I say "can," not "always will") have
more than adequate O2 at night with adding the bubbly. In
fact, I haven't in my own limited experience seen an O2
shortage unless the electricity shutdown overnight and the
pumps stopped. Which is why I've been curious about your
George, Roger's, & Dan's notes collected here are
informative, as is the whole thread generally:
While the conversation centers on CO2 injection at night,
it's a nice knitting together of notes about CO2 and O2
--- Raj <ggrk at blr_vsnl.net.in> wrote:
> Since plants consume O2 at night as I know it,
> heavily planted
> tank will deplete the dissolved O2 in 12 hours of
> darkness. The two main
> planted tanks are 50 gal with good water movement from
> Eheim 2217's. Two
> identical ones (including lights) one with Co2 injected
> and one with a
> spraybar. Both are lush green but the plants thriving are
> very different.
> Some time ago (a few years) I borrowed a DO
> meter and checked. In
> the day the O2 levels were either 6 or 8 ppm (saturated).
> At 8 AM I
> measured very low levels, I can't remember exactly and
> couldn't locate the
> data. The CO2 fed tank was the worst I remember.. I must
> get a meter again
> and report the numbers.
> I agree with you on air stones, but they are
> good tools for an
> aquarist with many tanks and interest in breeding etc.
> > > OTOH, I hate to see fish gasping in the
> > > in a densely
> > > planted tank with hyperactive plants (CO2 fed). I
> > > noticed this
> > > recently in a non CO2 tank.. time to thin the plants?
> > > There must be a
> > > balance between the plant density & fish population,
> > > difficult to estimate
> > > in my opinion.
> >I am curious about your low O2 levels despite the
> >presence of plants. Certainly, if your fish are trying
> >take in water at the surface ("gasping"), this suggests
> >that more water flow (air-water exposure) could be
> >to reducing stress on the fish. Also more water flow or
> >perhaps an improved water flow might help move nutrients
> >the plant surfaces to increase their ability to do their
> >thing (take in nutrients, photosynthesize, etc.) and
> >O2 levels enough in the day to last through the night.
> >My main complaint about airstones in aquaria, and it's
> >strictly a personal one, is that a bubble stream is so
> >artifical looking. so I'd rather use water flow pumps
> >(filters, powerheads, etc.) to move water.
> >Scott H.
> >* * * * * * * * * * *
> >So far it looks like this might be the biggest year ever
> for Aquascaping
> >Contest entries from countries outside of North America.
> >Share the fun; show your work.
> >The AGA's 6th Annual International Aquascaping Contest
> is open.
> >The deadline for submissions to the AGA Aquascaping
> contest is September 15.
> >Entries are only $5 and for that half a sawbuck you can
> have your AGA
> >entry automatically entered in the ADA (Aqua Design
> Amano) contest for
> >free, a savings in time and shipping costs!
> >Check it out at:
> >Aquatic-Plants mailing list
> >Aquatic-Plants at actwin_com
> Raj, vu2zap
> Bangalore, South India.
> Aquatic-Plants mailing list
> Aquatic-Plants at actwin_com
* * * * * * * * * * *
So far it looks like this might be the biggest year ever for Aquascaping Contest entries from countries outside of North America.
Share the fun; show your work.
The AGA's 6th Annual International Aquascaping Contest is open.
The deadline for submissions to the AGA Aquascaping contest is September 15.
Entries are only $5 and for that half a sawbuck you can have your AGA entry automatically entered in the ADA (Aqua Design Amano) contest for free, a savings in time and shipping costs!
Check it out at:
Aquatic-Plants mailing list
Aquatic-Plants at actwin_com