When I first started my tank...and before I found this site, I placed my sand first (I didn't have any live...but I do now!!), then I mixed my water and salt, aerated that for 24 hours. When I was ready to put the water in, I placed a large bowl upside down on top of the sand to pour the water on top of (very slowly). This minimized the sand cloud considerably, again, pour slowly. After that I adjusted my equipment. When the temp was right in the tank, then started shopping for LR!!
Not sure if this is 100% correct, but that's what I did...
Lisa :happyfish