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H ion modelling

>Last night while playing with my aquarium computer model I found that when
>ammonium concentrations dropped because of bacterial nitrification
>hydrogen ion became limiting to growth.  This concept was brought home
>rather solidly because I didn't design hydrogen limited growth into the
>model and when hydrogen became growth-limiting the model crashed.  I fixed

What happens to your model if you add a few drops of
say hydrochloric acid?

Richard J. Sexton                                         richard at aquaria_net
Maitland House, Bannockburn, Ontario, Canada, K0K 1Y0       +1 (613) 473 1719