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Re: Aquatic Plants Digest V4 #699

> ----------------------------------------------------------------------
> Date: Mon, 4 Dec 2000 13:44:10 -0700 (MST)
> From: "Roger S. Miller" <rgrmill at rt66_com>
> Subject: [none]
> Kevin Schulte wrote:
> > My question is that I constantly need to lower the PH and supliment Iron
> > to everything.  I have found a soil acidifier that works well for my
> > It analysis is S - 3.10%, Cu chelated 0.12%, Fe chelated 4.60% and Zn
> > chelated 0.12%.  I have previously add very small amount to the tank and
> > imediatly saw a white precipitate.  Does anyone know if I could add this
> > on a regular basis without harming my fish.
> Kevin,
> Welcome to the plant hobby!  If your 75 gallon tank has been set up for a
> while (say a year or two) then you could very well make growing conditions
> worse by taking it down and building in a "plant friendly" substrate.
> Aged, fine gravel or coarse sand substrates are good for growing plants.
> As to the pH problem, first it would be good to know what pH level you're
> shooting for, and why. Plants (and a lot of fish) aren't all that
> sensitive to pH.  Plants often grow better at low pH because that implies
> a better CO2 supply, not because they like the pH to be low.
> Normally we use CO2 to get the pH down to reasonable levels.


Hello Roger,

the statement of the last sentence "Normally we use..." is from my point of
view not quite correct. CO2 is used *only* to fertilize the plants by a
certain level, for example 20 mg/l CO2. By this injecting of CO2 you will of
course reduce the pH. But you should *never* use CO2 as a reduction-tool for
pH. If you would reduce the pH too, you should do it with water of lower
hardness. I am sure, this is wellknown to you and it's only a ansuitable
formulation in the sentence.
Best regards, Klaus.