thank you good sir!Why are you flushing?
Unless you severely nute burn her, never flush, ever.
The light green is early sign of lack of N, soon they'll be yellow. Feed her and don't flush. Other than that she looks fine.
You are 100% right.Flushing is one of those touchy topics that have voiced opinions on both sides.
For me personally, I believe "flushing" to be a last resort, emergency situation technique. I see it a lot, people flush for almost no reason in the middle of a grow, then a few days later complain about their plants yellowing up or growth gets stunted.
I'm not a coco grower, so I can't comment on that. But I assume the general rules still apply, don't take away a plant's nutes, ever. Only in extreme situations.