You should not rinse your sand. All those small particles become coated with the beneficial bacteria needed to activate your dsb and once they are the sand will settle on it's own. The bacteria will weigh it down and you won't have the dust storm. When I put the sand in my tank that already held water I opened the bag and immersed the bag under water and filled the bag with tank water and slowly (I mean slowly) slid the sand from the bag underwater. I had murky water for the first two weeks, I did the shrimp method and at two weeks I added my live rock. The water was still quite murky at that time. Within 24 hours of adding cured live rock at about 2 lbs/g the water was crystal clear. Go figure. I have also done this by adding sand directly from the bag into a dry aquarium. I then used a dinner plate to difuse the water as I added the water, it clouded up but not too bad, I added my rock and fish back into the tank and within a couple of hours it was clear as ever. So........don't rinse the sand, you are washing good particulate down the drain......be content to know that this takes time to set up properly.......don't add any fish until your tank is completely cycled......