an undesirable phenomenon in the aquarium are white residue on the plants, often called biogenic decalcification.
Why is not this required?
The biogenic decalcification associated with an increase in pH value, the effect may reach pH values of which are problematic for the fish.
What happens in the so-called biogenic decalcification?
It my view, occur after the 2 effects. First, it is
the equilibrium carbon dioxide. There is a certain amount of CO2 needed to keep the hydrogen carbonate in solution. When the plants absorb CO2 that balance, so logically the appropriate amount of carbonate is precipitated.
On the other hand plants when no free CO2 is present in the water, the record is at pH values above about 8.0 the case, the CO2 from the bicarbonate. That is, move it to a local protons on the lower leaf surface, and hence the pH value so that CO2 is released from the bicarbonate. On the upper side it comes from carbonate and is deposited as a white coating. In this case, pH values above pH 9.0 can be achieved.
How can avoid this effect? One should always
sufficient CO2 in the water may be present. This is not necessarily an addition of outdoor is required. It is sufficient if the pH value is adjusted in areas of less than 8.0, even better in areas of 7.5. While it can still come to the precipitation of lime, when the equilibrium carbon dioxide is absorbed, which alone is no dramatic increases in pH result.
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