I struggled with white cloudy water and green algae blooms for months, nothing helped. I changed the water every day, vacuumed and did whatever was necessary to maintain the aquarium. I've read some pretty scary reviews about people blaming this product for the deaths of their fish and whatnot. I remember a review where someone accused this product of killing all their brown catfish. All I can say to these negative reviewers is buy it, put it in your eyes and learn to follow the directions. This product cleared my 10 gallon and my 36 gallon noses crystal clear within an hour. My Cory cats enjoy swimming more than ever. Updating this product will clog your filter pretty quickly because it works. Just note how high the water level is in the rear filter before it overflows. If clogged, remove the filter media and rinse with aquarium water, then return to the filter.
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