I know at least a few people on here have used Marco sand. I am trying to rinse it, with no luck. I am using a net with the finest mesh I can find, and still at least 50% goes right through. How have other people rinsed this stuff, or have you just added it to the bare tank. I am thinking of putting it into the tank, adding my water slowly, and after it settles for a couple hours, running a HOB filter with some floss to take care of anything still floating in the water column. Any advice?