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RE: [APD] Water changes yet again

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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