Well I'm not a scientist so it looks like he's doing his job. My fish seem healthy after a few days and my water parameters seem fine after all my water tests. A few days later, knowing that I had overfed and overfilled my tank, I wanted to neutralize some of the ammonia, knowing I would change some water the next day. I used a little for this purpose and it definitely helped me. Ammonia neutralized overnight and so far so good after water changes.
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