Im wondering the same thing, I just put the substrate in the tank yestarday and did 2 water changes last night and 1 today. Still pretty cloudy. Its a mixture of florite and playsand (just like the article on sandy bottom written by buck). Anyhow, I'm still trying, although everytime I mess with it the dust seems to get worse. I'm hoping it will clear up sometime though. The playsand and florite mix looks almost like a river bottom, I think it'll look pretty good if the dust ever goes away.