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Title: It works!
Review: I have used this product multiple times to start quarantine tanks and hospital tanks (marine tanks, with both fish and coral.) It works; it's worked every time. I've never had my tanks spike ammonia or nitrite when using this product as directed. I'm amazed how many websites & forums claim that no such product exists. Also, the reviewer who says that you have to keep using it is wrong, for so many reasons (the bacteria don't get used up and die, they multiply, just like all bacteria, and also, all of the bacteria that would normally be in your tank if you cycle the traditional way will also still exist in the tank.) I've never used the product beyond 7 days, not even with water changes, and my tanks have never "crashed" when I stopped using this. I would, however, consider stocking the tank lightly, and gradually building up stock.
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