I got my 40B done & moved my 45 over today. When I went to move the sand it had a sulfur smell. I was told to replace it so I got some Live sand & used all but 10 gals of my old water(it went to my Q/T tank where my fish are currently at) should I expect any problems with new sand or will I be ok since I used my old water & when is it safe to add my fish?