i think you may have opened a can of worms
i myself do NOT personally subscribe to the idea of "bacteria in a bottle" as a feasible means of cycling a tank....especially overnight, which is ludicrous.
most of those products are kept on a shelf for X number of months, years, and are subject to huge temperature fluctuations during the shipping process...which IMO would render any viable bacteria (if any truly existed in the first place) useless.
i personally like to cycle tanks using straight ammonia, a few tough fish, cocktail shrimp, an established bio-wheel, gravel, etc. before using any of those products, which i feel are a waste of money.
M