Not quite sure what it did, if anything. You throw it in your tank, it hisses like crazy and your fish are downright scared, at least for a few moments. After that, I didn't notice any decrease in ammonia levels at all. I followed the instructions exactly. I ordered a pack of NitroZorb to fit my aquarium filter from Revain which arrived the next day and worked very well and did what I was hoping these tablets were advertised to do but didn't.
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