In article ,
Marco Schwarz wrote:
Hi..

I've kept neons and cardinals for years in hard water.
Lots of people have.

Are "cardinals" == Tanichthys albonubes..?

No. In north america "neon" means Hypessobrycon innesi and
Cardinal refers to Paracheirodon axelrodi.

T. albonubes is called "White cloud mountain minnow" or
just "white cloud" here.

They are still hard water fish(es).

The thing about acid water is it keeps to a certain
extent, bacteria at bay. I always suspect clenliness, not
pH or hardness when people have trouble with blackwater
fish.

Soft blackwater is clean because bacteria do not prefer such
conditions. And this is why soft and clean water is ideal
for several soft water species..

Depends on the bacteria. Scheel reported in _ROTOW_ that
Mycobacteria does not do at all well in hard water but he suffered
great losses from this pathogen when he kept wild caught fishes frim
soft water in soft water tanks. What he would do was always keep
them in hard water then only breed them in soft water.

He also found that in hard water the gonads would not develop
but found that peat extract (or any source of gonaditropine,
and you may not want to ask) would cause the sex organs to mature;
into soft water, breed, then quick back to hard water.

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