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Bam,

Is there a reason you believe you need to adjust your pH? Many
aquarists in North America would kill for your water-it is ideal for
Discus, Tetras, Apistos, and many other South American fish.

Of course if you are raising Tanganyikan cichlids, you may want some
more alkaline, harder water. In that case, CaCO3 would be the better
bet, because it raises both KH and GH simultaneously. Raising KH is
what raises pH.



One very good reason is that when the alkalinity gets too low you risk ph
crashes in a planted tank that will kill the fish. Plus if you are not
adding co2, the plants will need the bicarbonate for the carbon, and if you
are adding co2 you will need the extra buffering capacity of the
bicarbonate. gh isn't quite as important.

--

Margolis
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