Not really,
I need more information:
did you: setup a bucket with OR/DI water, add the salt, - mix it up and heat to the appropriate temp ~78 degrees, and let sit for a day?
No didn't use or/di. lfs said the water was fine. They tested it. water sat for about six hours, Used hottap water added salt let disolve and cool to tank temp. lfs said that this would be ok to do just as long as all the salt disolved b4 we put it in the tank.