So I was doing my usual water changes with my five gallon bucket... however... I added all the chemicals to the bucket before the water and this awful smell happened. ROTTEN EGGS. The chemicals I used were seachem prime, API PH DOWN, API STRESS COAT, and API STRESS ZYME. Any ideas if it was a chemical reaction? If I should still use the water? Or if I should just toss it it's for baby fry so I want to be extremely careful. Btw it dosnt smell after I added the water the smell went away. HELP!