03-29-2009, 11:27 AM
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As already mentioned, all of us notice the water is not as clear following a water change as it was immediately before, but that in my experience is normal and is gone by the next morning. Sometimes the tap water is cloudy (when they flush the mains, or heavy rains wash sediment into the reservoir) and it takes 2-3 days to clear. Of course, you indicate this only happens in 2 tanks, so probably something else. You may have too much filtration. If the filters are pushing the water through the tank too fast, the normal sediments in the water (which are not noticeable except when there are enough of them to appear cloudy) have no chance to settle down into the substrate. And I have noticed that some of this stuff won't get picked up by the filter for some time. Unless you have reason for over-filtering a tank (like providing strong current for a type of fish), I would suggest getting filters made for the size of tank.
A comment on using those clearing chemicals--don't. There is really no need, as the lack of clarity is due to something and if it doesn't clear normally then you need to find out what it is that's causing it, not mask it with chemicals. Also, those chemicals probably irritate the fish. I once used them when I had set up a new tank with different gravel that what I had previously always used (it turned out that this gravel was particularly "dusty" even though I had washed it far more than usually required--today after more than 10 years the tank containing this gravel is still the last to clear if it is stirred up), and after three weeks it was still not clear. I used the clear stuff and yes it cleared, but the fish obviously were stressed in their attempt to avoid the stuff. Last time for that.