I'm setting up a new 60 gallon with black diamond blasting sand and even after 2 hrs of washing, I am still having some issues... The tank sat overnight to let any remaining cloudiness settle, but this morning I noticed that the water is still.. gray looking? There's a fine residue on the walls of the tank, like dust particles that settled against the glass instead of going back down into the sand. Do I need to get a sponge and scrub it off, or will it eventually fall off on its own? I have also noticed there are several bits of sand still floating around in the water column (neither sinking nor floating to the surface). Should I just try to scoop these out with my net? There is a layer of sand still on the top which I plan to scoop out once the water level is a little higher and I'm not straining to get in there. I saw several suggestions about putting filter floss in the filter to help pick up these particles, but I am wondering if I do that if it's supposed to go around the intake like you would with a sponge, or if I should put it where my filter cartridges go? I have a penguin biowheel 350.