I am trying to add sand 50 -75 lbs to my current setup in a 260 g 30"high tank. I picked up 2 pup rays yesterday and they seem to like the small rocks as to my glacial rubble. I was thinking on using a tube I have from old sump return to pour sand into and have it go to bottom of tank that way, has anyone ever tried it and will the sand simply clog the mouth of tube when it hits the water. Do I need to clean sand somehow before adding to tank as well. My tank is pre-drilled and I have a 75g sump,I also use an fx5 on tank. I was thinking on shutting all down before adding to save impellers, and then turning on after "dust" settles a bit. Any other suggestions as to how to add sand would be appreciated. i will post before and after pictures.