I cannot find southdown sand at any of the home depots, thus another reason I hate living in the south. The only thing stopping me from finishing my reef setup is I cannot find a good sand substitute for the southdown without paying a fortune for it. Can someone please suggest a good cheap substitute for the southdown? I have seen different sands at lowes and home depot by quickcrete but was afraid to use them for fear of some kind of contamination in the sand or it being the wrong kind ect. Someone please help. What are people from the south using in their aquariums?