Re: [APD] KH with no CO2

[Jerry Baker <jerry at bakerweb_biz>]

Vaughn Hopkins wrote:
> Thank you Scott, Liz and Dave.  I'm still puzzled by the rate at which 
> the KH drops.  Yesterday I added about a half teaspoon of baking soda, 
> waited an hour and the KH was about 3 degrees.  This morning it was 
> barely 1 degree.  So, I added another half teaspoon of baking soda.  I 
> dissolve the baking soda in a little water before adding it.  I would 
> swear the plants are consuming the bicarbonate ions.  And, the lack of 
> CO2 is starting to catch up with me - a bit of green hairlike algae has 
> started on the microswords.  I should have the CO2 going in a day or 
> two though.  So, I will plan to remove all the algae I see when I do 
> the water change Sunday.  I feel like a mad scientist doing all of this 

One way you could check is to add some bicarbonate right at lights out 
and then measure it at lights on, and then measure again at lights out. 
If the bicarbonate only declines during the photoperiod it would seem 
likely that the plants were responsible.

-- 
Jerry Baker

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