RE: [APD] Water changes yet again

["Seweryn Bialasiewicz" <s_bialasiewicz at hotmail_com>]

In a long-neglected tank, the levels of NO3 (or even gH??) might be high or 
low, respecively. In which case, a 90% water change would dramatically alter 
the water chemistry, which the fish might have acclimatised over time to. 
This sudden change might put them into shock, ironically stressing them out 
or killing them as a result of "clean" water. Is this a plausible 
possibility?

- Seweryn


> > To get back to your first statement, there WERE a few people here who were
> claiming that big water changes were "dangerous" in various ways.  My
> argument was with the idea that larger water changes (let's say 50-90%) 
> were
> somehow inherently risky.  They're not, unless the tank has been neglected
> for a long time.

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