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Unread 05/21/2012, 02:32 PM   #51
Randy Holmes-Farley
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Yes, the higher the alkalinity the more stable pH will be because it provides higher buffering against pH rises and falls.


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Unread 05/21/2012, 02:38 PM   #52
GeorgeMonnatJr
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Quote:
Originally Posted by Randy Holmes-Farley View Post
Yes, the higher the alkalinity the more stable pH will be because it provides higher buffering against pH rises and falls.
Aren't alkalinity and pH directly related depending on the amount of CO2? I thought if you know any 2 you could calculate the 3rd. If that's true, does the amount of alkalinity change it's relationship to pH given the same amount of CO2?


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Unread 05/23/2012, 06:43 AM   #53
mos90
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alk is at 9 right now. corals seem to like it better. calcium is staying at around 420 so there is no need to dose extra yet. id like to try 10-11dkh and see how the corals react.


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Unread 05/23/2012, 07:02 AM   #54
mos90
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Quote:
Originally Posted by GeorgeMonnatJr View Post
Aren't alkalinity and pH directly related depending on the amount of CO2? I thought if you know any 2 you could calculate the 3rd. If that's true, does the amount of alkalinity change it's relationship to pH given the same amount of CO2?
i think that is true but im almost positive that variables like kalk dosing can alter that. i dont think kalk changes co2 but raises ph and alk.


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Unread 05/23/2012, 08:16 AM   #55
Randy Holmes-Farley
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pH, carbonate alkalinity and CO2 are mathematically related and knowing two gives you the third.

Limewater (kalkwasser) raises pH because it consumes CO2 in the tank to form bicarbonate and carbonate from the hydroxide it adds and the CO2 in the water:

OH- + CO2 --> HCO3-


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Unread 05/23/2012, 09:41 AM   #56
mos90
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got it....

is it possible to hurt corals by having a lack of co2? i would think it wouldnt harm fish.


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Unread 05/23/2012, 12:46 PM   #57
Randy Holmes-Farley
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There is no lack of CO2 unless the pH is too high, and that brings its own problems.


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