Fish die in fish shops. That's to be expected. They die in my tanks too, occasionally. My problem with some pet shops is that they don't get the dead fish out. There is no excuse for letting a dead fish stay untill it starts to decay.
Topic #2... Fishless cycle/ ammonia. Good advice in this thread. I would like to add that if you choose to measure ammonia, stay with about 3 ppm instead of 5. Ammonia is actually toxic to the bacteria you are trying to cultivate and high levely will inhibit the growth.
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