I saw a great utube video about adding sand to a saltwater tank that created absolutly no clouding. I don't know how to link it so I'll just describe what he did.
He took live sand (washed) and put it in an empty water/pop bottle. He then slowly lowered it slowly (right side up) into the tank till it filled with water, brought it down to the bottom of the tank then turned it upside down and just let it drop out of the bottle, giving it a little squeeze once in a while if it clogged. As the sand dropped out of the bottle, all of the cloudiness got trapped in the bottle. After the bottle emptied he brought it back to the top of the tank (still up side down). At the top of the tank he flipped the bottle right side up and lifted it out. Absolutely ZERO cloudiness! It was amazing! If anyone can find this video and link it here I think you all would be astounded. I'll try to find it again and see if I can figure out how to link it but I doubt I'll be able to figure it out. You really gotta see this video.