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I bought a bottle shortly after I started my tank, and have been dosing per the directions every time I siphon the substrate and do a larger cleaning (not on every water change). Not sure how much it does, but I will say that my tank seems fairly stable for a 9g. Once I'm through with the bottle, I probably won't re-up on it though. I doubt it's needed after almost 2 years.
What I tell myself is that I keep the population of bacteria diverse and keep potentially bad ones from taking a foothold as a result. Not sure how much truth there is to that, but I'll bet it's a bunch of BS.
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