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Re: musings on water changes: pH change and Osmotic stress

I have witnessed some of what has been discussed here in person.

An acquaintance of mine, Joe Gargas, demonstrated to me a pH change of
almost 4 POINTS!!  He maintained the conductivity at a constant range but
took the water down four points, waited a few minutes and brought it back
up.  The whole time the fish seemed to be unscathed.  HE maintained that if
the osmotic pressure stayed constant then the pH change won't stress the
fish.  However, if there were ammonia in the tank of a large enough
concentration, and you raised the pH 3 points, you could scald the gills of
nearly every fish in the tank.
While Joe might not be the least abrasive person in explaining these things
to the layman, There is no proof like being there to see it.  Mike Jacobs
might be able to chime in here, and someone else wrote an article on this in
a JAKA a year or two ago.  (yes?  No?)   Anyhoo, pretty neat fishy science.

For what it's worth,

Allen "Boat" Boatman
Lutz, FL

"It doesn't matter how many say it cannot be done or how many people have
tried it before; it's important to realize that whatever you're doing, it's
your first attempt at it."
~ Wally Amos ~

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