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Re: [APD] KH question and pH crash

gbooth at frii_com wrote:
> From this it is clear why aquariums with low KH seem
> unstable - as acid is produced by biological action, the KH is used
> up; when it is gone, the pH is free to drop rapidly as H+ ions are
> generated.

I suppose the H in NH4+ (ammonium) has to go somewhere after the 
molecule is broken to make NO2-- and NO3- by nitrifying bacteria. 
However, if plants are absorbing the NH4 directly, what are they doing 
with it? Does it result in free H+ ions, or are all the atoms consumed 
in the process? A little KOH could be of use in the aforementioned 
situation. You get K without having to add some unwanted anion.

Jerry Baker
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Aquatic-Plants at actwin_com