I recently had a similar problem. What is your pH and KH. I had a pH/KH crash the exact same time this happened. I did pwcs every other day, but the only one that helped was one where I did 75%. The next day the water was clearer, and then the day after, crystal clear, even more so then before. As too what caused either the pH crash or the cloudiness, or even whether the to are correlated, I am clueless.