Thanks for the help. For the past 3 evenings I my FC has tested between 9 - 10 ppm. I have been taking it up to 12. So it seems to have lost 2 - 3ppm during the day. I will say that the past 3 days have been un-seasonally cloudy with brief rain showers. So there has not been any swimmer activity. Also, I tested my CC this evening since we have had some brief showers, and after adding the 5 drops, the water barely turned pink. And after 1 drop it cleared up completely. (10ml sample) So am I correct in assuming that my CC is somewhere between 0 - 5 ppm? Should I shock right now?

Also, I will start following the advice above and only taking my FC up to 10 ppm each evening, unless I start seeing it fall below 5. The good news is that until Monday, (4 days from now) I will be home during the day, so I can keep up with it if it starts falling too low.