Leaves turning light green -- yellow (after 12h day/night rhythm)

That’s the stretch brother, that’s where the plants needs the most light and water in all her lifecycle. She’s missing N due to deficiency, wrong pH or water amount/schedule

I would say initially it was probably lack of nitrogen giving issues. Now that you have flushed she’s probably in need of everything. If it was me, I’d give her a feeding with grow bloom micros and some of your calmag. She’s probably pretty hungry as flushing has probably removed three things

Looks like nitrogen deficiency to me. They still need a little nitrogen even in flower. It looks like you haven't given any in a while based on your diary. Give them a little nitrogen and they should start to green back up. Best of luck! Happy growing!