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Yes, pH is determined largely by the ratio of CO2, -HCO3 and --CO3, likely you have a lot of free CO2 and a fair amount of -HCO3, this will result in a lower pH than a higher level of --CO3, over a month or so, the kalk will bind the CO2 and HCO3 and raise the pH. You might also consider backing off the CO2 a little or slowing the drip rate of your reactor, just a small change, this will reduce the free CO2. More flow and surface agitation will also help.
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Roger Vitko
Tunze USA
"He's for every one of us, stands for every one of us, he'll save every man, woman and child in a mighty Flash!"
Current Tank Info: 210 gallon planted tank with Altum Angelfish
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