Do a search on RC. There are several big threads. It was a bit of a fad (for lack of a better term) a couple years ago, which has since died down.
You have to be extremely careful not to overdose and it is NOT a panacea - you still need to keep up with regular maintenance and water changes.
I tried it for a few weeks with very small amounts and didn't see much difference, but my bio-load was low and my nitrates were <5ppm to begin with.
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