A couple of weeks ago I introduced a mangrove bogwood piece in my tank. I kept an eye on pH and KH over this time and observed something interesting ...
Before the introduction, pH was ~ 6.9 and KH ~ 4. Since than, the KH slowly went up to 10 and pH to 7.3 . I was under impression that tannins from bogwood would lower both of these values, not the other way around
.
Anyhow, by doing some design modifications on the reactor, I managed to increase the CO2 level to about 29-30 ppm, so the pH went back to 7.0, but I'm wondering now if there is something wrong with this picture.
Mind you, the mangrove piece was boiled, and soaked for few weeks prior to introduction to the tank, and there is no visible coloring of the water by leaching tannins.
Can anyone give me some logical explanation?
Before the introduction, pH was ~ 6.9 and KH ~ 4. Since than, the KH slowly went up to 10 and pH to 7.3 . I was under impression that tannins from bogwood would lower both of these values, not the other way around
. Anyhow, by doing some design modifications on the reactor, I managed to increase the CO2 level to about 29-30 ppm, so the pH went back to 7.0, but I'm wondering now if there is something wrong with this picture.
Mind you, the mangrove piece was boiled, and soaked for few weeks prior to introduction to the tank, and there is no visible coloring of the water by leaching tannins.
Can anyone give me some logical explanation?
