12-07-2009, 07:49 AM
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How long has the tank been cycled? There's also the possibility of the fuzz being a sign of a bacteria bloom if you've change enough of the water and cleaned too much of the filter media - you'd get into a situation where the bacteria has to re-establish itself and may cause a white fuzz/foam/bubbles/whatever...
You'll find that the answers you get from people here will be that much more detailed if you give them more details about your tank: size, water parameters (pH, Ammonia, Nitrite, Nitrate, gH), how often you feed the fish and how much, how often you change the water and how much, how often you clean the tank/filter, etc.
Did you do anything differently lately that might have caused this?