I've been pulling my hair out with sps problems and high nitrates. I was told the corals turning white was from water temperature being over 80 degrees, but that info was from a west coast coral dealer that didn't give much help about anything without seeing my tank. I started with Nopox also, but then spoke with a LPS with over 40 yrs experience. He was against dosing vodka or vinegar, and impressed that the nitrate source needed to be eliminated first. Yep! Everytime you speak to someone, who should know, you come away knowing even less.