10-25-2009, 12:47 PM
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Causes could be a bacterial bloom; biological equilibrium off due to fish overcrowding, overfeeding, decaying matter, infrequent water changes; or suspended particulate matter in the tap water. I've had the latter at certain times of the year when heavier rains wash soil into the water reservoirs and some of the very fine particles come through.
Testing for ammonia, nitrite and nitrate would be a good start. Also, run a large glass or clear bowl (the wider the better) of water from the hot and cold tap and see if it is clear. Sometimes the hot water heater can cloud the hot water, or sediment is just in the water as I mentioned.
If all tests are OK, and the fish do not show abnormal activity or signs of stress, I wouldn't worry. And don't use those clarifiers; they work by coating particles, and they do that in the fish gills--which is why the fish usually move to the other end of a tank when they are added. Years ago I used one, never again; chemicals do not belong in an aquarium.