Sapphire OG grown w A.B.L.E Grow Chamber

I think you know what to do whith the leaf. But MAAn what a nice Growchamber, you may tell us something about those, would be interersting for us. Please be so kind and give a detailed description of the content of your Hydroponics growchamber. I am totally impressed. and some things you can only see on Growdiaries. Iam interested in Hydroponics but i dont dare to start. well however happy growing

Its not too late at all to defoliate. Some people will defoliate before the 12/12 flip to open up budsites and create less shaded spots, and then do an additional defoliation after the flip. If you chose to defoliate it probably will still help the budsites since youre only 3 weeks into flower, but it'll also help bring your humidity down...less canopy..less moisture being generated by the foliage. If you take a small % first 10-15% you can always take away more, so id start small..evaluate the difference then clip more if you feel needed. Happy Flowering and love the grow box ✌️

Wow 2000 PPM, that's some strong solution, I'm amazed your plants didn't burn. To answer your question, yes I would reduce the nutes prior to the flush, specially since your leaves are really dark green.