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Re: [APD] Aeration & a planted tank
Yes, Erik has done a great job of archiving that thread. I
remember reading it. I agree you on the O2 level possibilities. We have
terrific power outages here in India, part of life for us..
I think the behavior of a planted aquarium is highly variable. If
you consider 1. Thinly planted 2. Moderate and 3. heavily forested with
that in mind 1. Thinly populated 2. Moderately & 3. Heavily populated (not
forgetting the snails :-) ) and like wise water hardness.. amount of
circulation.. CO2 injected or not.. agitation.. we end up with too many
variables. In time some clarity will develop from list members efforts and
discussions I hope.
Most setups discussed on APD are (I think) moderately planted,
thinly populated and moderate to low hardness water. Compared to my Heavily
forested tanks with moderately hard water (Kh 8+) and heavy population
(they grow & breed)..
So anyone following discussions here have to keep that in mind..
maybe an ideal tank definition needs to be (repeatedly) stated with
variation above or below that.
At 25/08/05, you wrote:
>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.
> > Raj
> > > > OTOH, I hate to see fish gasping in the
> > mornings
> > > > in a densely
> > > > planted tank with hyperactive plants (CO2 fed). I
> > have
> > > > 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
> > abundant
> > >presence of plants. Certainly, if your fish are trying
> > to
> > >take in water at the surface ("gasping"), this suggests
> > >that more water flow (air-water exposure) could be
> > useful
> > >to reducing stress on the fish. Also more water flow or
> > >perhaps an improved water flow might help move nutrients
> > to
> > >the plant surfaces to increase their ability to do their
> > >thing (take in nutrients, photosynthesize, etc.) and
> > boost
> > >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:
> > >http://showcase.aquatic-gardeners.org
> > >_______________________________________________
> > >Aquatic-Plants mailing list
> > >Aquatic-Plants at actwin_com
> > >http://www.actwin.com/mailman/listinfo/aquatic-plants
> > --
> > Raj, vu2zap
> > Bangalore, South India.
> > _______________________________________________
> > Aquatic-Plants mailing list
> > Aquatic-Plants at actwin_com
> > http://www.actwin.com/mailman/listinfo/aquatic-plants
>* * * * * * * * * * *
>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
Bangalore, South India.
Aquatic-Plants mailing list
Aquatic-Plants at actwin_com