If you are going to change the sand then Id suggest you get plain old Caribsea Agramax sand, not live sand.
Also once you get it, cut 1/4 of the bag from the top and slowly lower the open bag with the sand into the tank. Make sure you keep the bag closed with your hands as you lower. Once you place it at the bottom, slowly begin to release the sand. I suggest this is because its better to dump sand from the bottom of the tank rather from the top. It will cloudy for sure but since the sand have larger particles than playsand it will perfectly clear in an hour or so.
Also the thing about playsand is that they might not be calcium carbonate based. I dont know about lowes standards, but Southdown is the best option if you want to go for cheap playsand. But then again if $$ isnt an issue then the right SW hobby sand is recommended.
HTH,