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Nature's purifiersPlants take up ammonium, which is toxic to fish. Yet they also protect fish by removing heavy metals such as lead, cadmium, copper and zinc. But they also extract nitrate. Now although levels of up to 50 parts won't have an adverse effect on fish, higher levels are toxic. Besides, algae feed on nitrate, so controlling this pollutant helps counter algae outbreaks.-----MORE Plants
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