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Re: [APD] Barr Method Question
I think that's right. I was only saying, in effect, you're
continually dosing nitrates when you feed the fish and with
lots of fish (food/poop), the frequency of changes matters.
One could take that back to the way you presented it, by
factoring in the food/poop as the total dosing. I guess
that's what you were saying below. But it's hard to know
precisley what that is. YOu could measure nitrates daily
and develop a good estimate for a given tank. But the easy
way to deal with it is to do the changes often -- as Tom
says, "reset" your tank.
--- Andrew McLeod <thefish at theabyssalplain_freeserve.co.uk>
> On Fri, 5 Dec 2003 15:11:25 -0800 (PST), S. Hieber
> <shieber at yahoo_com>
> > It would seems that holds only if the only nitrate
> > for example, is the chems you're dosing. Lots of fish,
> > complicates things and the frequency matters, just in
> > sense that, if you wait too long between changes and
> > nitrates keeping climbing, well, the inevitable end
> > pretty.
> > Scott H.
> > --- Andrew McLeod
> >> The frequency of your changes is irrelevant to the
> >> level of nutrient
> >> you will have AFTER each change
> >> and fertilisation, but to avoid spikes change water
> >> regularly.
> > =====
> > S. Hieber
> That was the (horrendously inaccurate) assumption I was
> making. But if you
> were adding 10mg, and the plants took away 6mg per
> interval of water
> change, then you could simply assume you were adding 4mg
> and the method
> would work. Presumably by maintaining a constant nutrient
> level level,
> constant fertilisation and regular measured water changes
> you could find
> the amount added/removed by fish/plants per unit time.
> I was about to ask how much nitrogen fish pooped and
> plants removed, but
> then I realised that nitrogen inputs (food, fertilisers)
> must equal
> nitrate out (water changes, plant matter), if you could
> that out.
> That's assuming that aquatic plants don't absorb
> atmospheric nitrogen,
> like terrestial legumes (says my hazy knowledge of GCSE
> biology). Do they?
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