Cannot really tell based on your descriptions, would be helpful if there's some pictures of your guppies.
Most fish shops do not keep their guppies properly as the tank housing them tends to be overcrowded and disease spreads fast when the water is dirty. From your descriptions, my guess is the fish were already quite sick when you brought them home. Possibly the white flaky stuff you mentioned are actually fungus. Fungal infection spreads fast and is deadly.









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