I am planning to start a shell dwellers tank soon and I was looking for a perfect substrate for them. I hoped I could use a crushed coral sand I brought from South Florida beach, but I soaked it and rinsed it several times and it still stinks like sh#%^$. I am planning to use a coral rock in that tank to raise PH so I need a white substrate. I have some black fluorite left but will it look good with white rocks and shell dwellers? So my question is where to get white sand? I tried both Lowe's and Home Depot here in Brooklyn but all they have is playsand which is yellowish. So, white sand anyone?