10-17-2009, 07:21 AM
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I would urge all to read this article paying close attention to the paragraph ..(stability revisited) Sudden changes in water chemistry with large water changes can, and does ,affect fishes osmoregulatory functions. Is why frequent small water changes are less stressful for fish and water doesn't get a chance to deteriorate. In my expierience,there are fish that are sensitive to sudden changes such as that from large infrequent water changes and it is why I practice and preach frequent small water changes.
If one adds gravel vaccuming a different area of the tanks bottom with each water change or every other water change,, then much of the crud that contributes to total dissolved solids or crud,can be kept to a minimum and this along with the frequent small water changes will keep the tank cleaner. Clean water will always result with healthier fish. Not overfeeding the fish ,and not overstocking ,will also result in less crud which =cleaner water.
Ideally, in my view,, we would perform 20 to 25 percent water changes three times a week, or two 25 percent water changes ,with one 50 percent water change on the weekend. I believe all fish would benefit from it. IMHO.