After adding AlgaeFix by API, my water is white and cloudy?

Water changes...always a good thing....
 
AlgaeFix is fish death in a bottle.My fish were fine and after using it my 2 tinfoil barbs started acting funny.The next morning one of them was dead and the other stopped eating for 3 days(they usually eat like pigs).He started eating again this morning...Im done with harmful chemicals.
 
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