Dosing 114ppm CO2? Is this correct? - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 04-18-2005, 06:07 AM Thread Starter
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Dosing 114ppm CO2? Is this correct?

Hey guys,

i have the following "strange" situation with my 58 gal. heavy planted tank.

KH is at 6 degrees, ph is set to 6.2 . this results in 114ppm of CO2 in the tank.

i filled a glass with water from the tank, after 24 hours i measured its KH which for some strange reason was 8 degrees and ph was 7.5 (CO2 = 9.6)

this results in 114-9 = 105ppm of CO2??!!!

am i measuring something wrong here?

please advice on this. i want to make sure that i'm injecting more than 30ppm CO2 (as Tom Barr recommends).


thanks in advance,

Harry
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post #2 of 5 (permalink) Old 04-18-2005, 06:51 AM
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I hope you don't have fish in the tank? 114ppm CO2 is a bit dangerous for fish, although we don't know exactly how much is too much. Why do you go to such extremes?

What does not make sense is KH=8 once you take your water out of tank for 24hours. I would RE-measure these values once again. It DOES make sense that most CO2 escaped after 24hours, and therefore, higher ph value.


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post #3 of 5 (permalink) Old 04-18-2005, 07:13 AM Thread Starter
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my thoughts exactly. how could KH climb to 8 degrees?

actually, my tank is overstocked but the fish dont complain. except from the catfish and their habbit to reach up the surface, and then dive again.

so just raise the set point of the ph controller to 6.6 - 6.7?


thanks
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post #4 of 5 (permalink) Old 04-18-2005, 07:58 AM
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Harry,

The glass of water should be 3.7 ppm of CO2(same as the air surrounding it). That's the reference.
Test kit error?
Seems like it.

Method to test pH?
Your tank may eat some KH due to excessive waste in the substrate or due to low CO2 levels and the plants going after the KH.
A number of things can artifically depress the pH reading and give you and false positive(appears to be more CO2 than is really there).

Regards,
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post #5 of 5 (permalink) Old 04-18-2005, 08:18 AM Thread Starter
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Tom, how do you suggest i should deal with this issue?

how can i measure how much CO2 i'm injecting in the tank? target is anything greater than 30ppm

here is my fish stock (i know, too many fish, but i do a 60% water change every saturday)

1 clown loach
2 German Rams
4 cories
8 cardinal tetras
5 platy
7 pristella tetras
4 rummy-nose tetras
3 rasbora
9 japonica shrimps
3 cherry shrimps
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