m0useanswered grow question 5 months ago I agree with Asnoriu.
I think your have an issue with PH and maybe buildup in the medium.
I do not see any PH or EC readings on the diary so this might have been a long time coming.
Ideally you want some runoff with every feed to avoid flushing, flushing can be stressful as well.
Some of pics do tell a story of it wanting more N though. classic symptoms. progressing from the bottom up on bigger fan leaves.
So you need to look into what your feeding them and go from there. PH in the range of 6.2-6.8 is fine but the sweet spot is aorund 6.4 I find.
Good Luck!