Okay...I didn't even know what Southdown was until today when I started reading about it here. I was gonna buy some live sand but this sounds much cheaper. So, I went to home depot here in Mt Laurel, NJ and picked myself up a 50 lb bag of it. $3.84 and that's it. There wasn't a crowd congregated around the pallets of it. Nobody raced me to pick up the last bag. I didn't have to sell my 1st born, I don't know anyone in the mafia. I have no political connections. I just walked up, picked up the bag, and checked out. So anticlimatic after all the hype I read here. BTW, now that I've got it, do I have to treat it at all or can I just add it to the tank straight away? As an aside, I hope this doesn't pain anyone outside of the NE, but it's kind of funny. When I was getting the bag out of the car to bring inside, it snagged on the doorway and ended up spilling about 1/3 of it in the driveway. Bummer.