04-08-2013, 03:15 PM
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Originally Posted by MoneyMitch
if you notice some plants will use CaCO2 as a carbon source which has a direct impact on your kh which in turn effects your ph. the more caco2 the plants use the more your kh will lower in a result of a lowering ph. the naturally occurring co2 in a tank is minimal and the built up stores are used within gthe first few hrs of light on. the effect of naturally occurring co2 on ph in a aquarium is minimal. about the same as the plants using the caco2.
except that with a heavy fish load there is significant co2 in the water.
And I remember seeing one analysis by dr randy holmes farley that plants actually return carbonate to the system as they reduce nitrates to plant tissue. And in the same amount the aerobic bacterial used up the carbonate (alk).
From the same article the anaerobic /anoxic bacterial also add carbonate consuming nitrates.
My observation is that even with peat moss in the substrate I have a pH of 8.4-8.8 (api high range test kit) in my tanks.