1. CC's are consumed when you "shock" which is frequently referred to as breakpoint chlorination. You didn't post test results but it sounds like you probably need to shock again.

2. Time for a filter inspection. Any filter should return only clear water to your pool.

3. Running at night is your call. Adding chlorine in the evening is a very good idea. I add chlorine around sunset and shut the pump off before bedtime......just my personal choice.