Due to the fact that in some localities the natural water supply is
alkaline, in others neutral, and in others acid much has been written
about controlling aquarium water.
Many aquarists believe that a slightly acid condition in the aquarium is
desirable.
There are a number of reliable water testing sets available at very
nominal prices.
Most of the fish described in this book seem to thrive and breed better
in slightly acid water (about pH6.8).