From what I remember of other posts about API's Quickstart, it does not contain the actual bacteria that would grow in your aquarium once properly cycled, but it does contain similar type(s) of bacteria that will aid in the acceleration of the nitrogen cycle, which in turn will eventually propagate the necessary bacteria in your aquarium. This bottled bacteria works like the actual BB, I guess in a sense temporarily replaces the real stuff until it grows. I have been using it to jumpstart new tanks and it works decently well. You will still need to monitor water parameters, and do partial water changes as needed, after you add your fish. I just would not put any delicate fish in until after, best to start with hardy fish that can tolerate adverse conditions.
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