I hope I never end up in that store because they have steered you in THE wrong direction.. Your parameters as mentioned should not cause a problem, however you do not mention your acclimation method. The PH and other water parameters of the store can vary greatly from that of your tank. Ph shock can be the number one cause of delayed fish death. Fish should be slowing acclimated to your tanks water by first allowing the bag water to reach tank temp, then SLOWLY dripping water into the bag with the fish for about an hour. I use airline tubing with a plastic control valve on the end. When the bag is full dump half the water and drip again. Its also good practice to quarantine fish before adding them to your tank but most don't have room for another tank. I use a 10 gallon under my main tank for this.
My tip to you is to test a sample of the bag water when you buy a new fish and compare it to that to your tank water. It may surprise you...
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