I've done playsand in 2 tanks now and the cloudiness sucks, I hear ya. It may be a labored effort, you can ask my girlfriend who helped me lug buckets both times, but do round after round of water changes while disturbing as little of the bottom as you can will clear it up the fastest. Both times it took me about 3 hours worth of nonstop water changes to get it to clear up, but it worked and it was done on day 1. When you are refilling the water hold a bowl at the waters surface and pour the water into it directly and let it overflow to keep from disturbing the sand on the bottom. I've tried a few different methods and this is by far the easiest.