08-11-2010, 11:11 PM
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Some water supplies have alot of sediment. Where I live there is quite a lot and after a water change it takes a day or two for my filter to take care of it all. Another possibility is that there is something in your tank (wood, non-aquarium decor) that is leeching into the water. Could also be the filter, most filters are flow-by not flow through filters and many have media that is to porous for fine particles. We would need more info to pin it down. Tank size, filter, decor, etc. Pictures would help as well.