Ok, OCLT was 0.5 ppm from 8.30 pm to 6.30 am. So this is at least good, right?
What should I do now? Increase CYA to what?
It has been poring rain all day and I just checked the PH and it still seems to be 7.8.
(It was cloudy yesterday and I started the morning with FC 18 and ended the day with...