MrJonesanswered grow question 4 years ago Reding through your Diary, I do not believe its not a PH issue, if your runoff was 6.3, I always shoot for 5.8 to 6.8 in a very similar soil makeup, you are 50 days into flower on a strain with a 50/55 day flower target, looking at the rest of your grow and back a few weeks, my thoughts are it is just starting to fade, anything you do now will take a week to 10 days to see if it is making a difference, and it will be harvest time, I would start your pre-harvest regiment, for me it was just PH H20 letting the plant feed off its self, hope this helps!