I am not sure what the ph of the store tank was, but i let the fish float in the tank for 20 minutes, adding water from my tank for the last 10.
I dont think i did anything wrong introducing things, but i might have with the plants i added last week ( before the neons), i didnt know i had to wash them first, is that really bad??, i really dont want to tear down the tank and clean it out.
Oh, and i never let any of the store water in my tank.