My ammonia and nitrates went through the roof in my 20 gallons. I used the product and tested it after a few hours and it reduced it to almost nothing. I used a little more as directed and tested it a few hours later and the ammonia, nitrates and nitrides were all zero. Fish are healthy, plants are healthy. no smell. Simply outstanding. Uses a small amount so it lasts a while. Highly recommended. You can't go wrong with this product. I will buy again.
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