Now how I kept the sand storm effect down. I'm using the fine grind I have found that if you dont rinse,then put your sand in stir with you hand. Doing this for a little while sifts alot of the small stuff lower in the bed. Next lay in salt water only enough to cover the sand, then rod the sand to release the trapped air in sand.Wait over night to continue this compacts the sand a bit. Next cut a piece of painters plastic to fit in tank and hold down with a couple of rocks. Now at this piont you can add water without the storm. When finished filling roll up plastic and remove it. If you try and pull it out it will vaccum and pull sand up with it. The fine sand makes a nice compact mud in the very bottom that promotes low oxygen bacteria.