I had this problem once - used something called Crystal Clear:
http://www.aq-products.com/APpro/crystalclear.htm
A few drops cleared the water in a matter of hours. I did have to switch the polyester media twice though - just used PolyFill jammed into the back of a power filter.
http://www.aq-products.com/APpro/crystalclear.htm
A few drops cleared the water in a matter of hours. I did have to switch the polyester media twice though - just used PolyFill jammed into the back of a power filter.