If the tank is cycled then the water will be biologically filtered without you adding anything mechanical. Besides, nitrite and ammonia poisoning sometimes takes weeks to show. Its like small toxic levels of mold in a house, or chemicals at a factory where people work. Your breathing in small levels fine for weeks, months, or years, and then bam, you find out you have some sort of cancer or some deadly effect.
I do wish they would have mentioned the pet store cups. The cups, in my opinion, are the best way to transport individual bettas from breeder to buyer. The fish are in individual cups so they can't spread disease or hurt each other. The cups aren't easily smashed or punctured during the transport process, as are bags for fish. Also, the cups allow for individual care (though some stores choose not to administer to the fish). Bettas have such a quick turnout rate that they do not spend that much time in the cups. They are meant as a simply a seperation and transportation device fit for the species.
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