I have a question about substrate selection. I wanted to go with live sand at first, till i realized it was like 100 for 20lbs.... Now i am wondering what would be a good, and affordable sand to use for my upcoming reef aquarium?? I saw a post earlier about play sand?? Would this be a good sand to use? Or should i go with something else? I've got everything else picked out, but my substrate... So, any suggestions would be appreciated, thanks.