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Here is a simple safe way to estimate the correct pH change

Here is a simple safe way to estimate the correct pH change to get to the required ppm of CO2 for any tank buffer system.

Get a selzer siphon. Fill it with 1 L of distilled water. Charge it with one 8 gram CO2 cartridge and put it in the refrigerator overnight.

This is your standard 8000ppm solution.

To figure out how much CO2 to add to get to 20 ppm use this calculation:

Qty = 20mg./L * 3.78 L/gal *TV / 8

Qty = the volume of the 8000 ppm solution to add in ml.
TV is your tank volume in US gallons.

Now here is what you do.

Measure the pH before adding the calculated amount of CO2 then measure the pH after adding the CO2. The difference is the pH change need to bring your tank to 20 ppm CO2.

Now here is a thought. Why even bother, just add the right amount at lights on. The pH will change when you add the CO2 but if you have a well buffered system, it will not change much!
 
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