Review on Enhance Goldfish Health with API Goldfish Care Pack's 1.25-Ounce Aquarium Water Conditioner by Linda Peoples

I had 2 fantail goldfish for 5 months so they became part of our family. I brought this product to make tap water safe for my fish. I changed the tank to 20 gallons and added this product to my tank. I had my aquarium filtered with this product for 15 minutes. Place my fish after the wait time and my fish has been dead on the bottom of my tank for 30 minutes. what I did differently after 5 months with these fish. I put this product in the water of my poor fish. tears