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pH, temp and sexratio

[Mike Wise wrote]
>The secret to getting the proper ratio of males and females
>depends upon finding each species' preferred pH value.

Has anyone got a chart of pH and temperature values needed for a 50/50
balance in the various common species of SA apisto? The big-time breeders on
the list must surely know the rough answers even if they've not done
controlled experiments.

All I know is that the few fry that survive in my community tanks have been
invariably female. But I wasn't sure whether this was due to water
conditions or just that females are tougher (pH between 6.5 and 7, temp of
26 C, GH 4, and fish were macmasteri and agassizi).

from John McCrone

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