Ok...I have discovered from a previous post that there are options for adding additional sand to my sand bed. I wanted to buy Southdown, as I was advised, but there is NO Southdown available in my area (South FLorida). All HD has is silica play sand. Can silica sand be safely added? If not, what are other sources of inexpensive quality sand to add to my already 3 to 4" live bio-active sand bed?



