Re: [APD] Aquatic-Plants Digest, Vol 93, Issue 4

[Jerry Baker <jbaker6953 at gmail_com>]

On 12/5/2011 9:49 AM, Karen Randall wrote:
> The fish in these habitats have absolutely no problem adjusting to these changes.

I've never seen someone propose a plausible mechanism explaining why a 
fluctuating pH would bother a fish to any significant degree (barring 
the obvious problems with extreme acidity or caustic pH values). So what 
if the pH goes from 8 to 6.5 as long as the osmotic pressure on the 
fish's cells remains relatively constant (i.e., GH & KH remain stable). 
I suspect, as many on this list have pointed out, that hobbyists early 
on noted a strong correlation between pH changes and fish health issues, 
but didn't think of the two having a common cause rather than assuming a 
cause and effect relationship.
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