Curling and yellow leaves flower stage

Like MAIN THING , you dont flush in SOIL. This is for coco or hydro. You will create yourself more problems than sort anything. Just stop ANY feeding for 2 weeks. Water WHEN needed, as much as needer, with small run off , with good ph (6.2-6.5 range). That sorts a lot. Products like Ecothrive Biosys helps to cope with excessive nitrogen, plus loads of goodies as for roots to befriend as for soil to enrich.

You guys are amazing! Thanks for the help. - I flushed it with 6.2ph water from tap ( tested it ) - ordered a second fan for the Lower part of the tent - opened in total 3 air roasters. - aimed current fan to the side will rund 24/7 - ordered a heating bar for grow tents. Did I miss any? Keep you guys informed 😊

In my eyes, you have iron toxicity comes from an uptake problem, improper PH, and lockout, also what they say about nitrogen toxicity you need to flush, lower the dose of nitrogen, and fix your PH

I agree with AsNoriu that you got some serious Nitrogen toxicity. Need to correct that fast as it can lock out other nutrients if it build up to high in the medium. Might need a flush if its liquid nutrients. I also Agree with Ezzjaybruh that your RH is way to high at night. This is when WPM and moulds aka bud rot are going to set in. keep the extractor fans on and tent fans pointed at the walls to create a gentle air circulation. As for temps you don't want them to jump aorund to much. I aim for about a 10 or 12 degree difference between day and night temps. Ideally I would have my nights at 17c and day at 27c if possible. Colder temps make it slower and can start to give the plant fall colours on its leaves. Good Luck!

Don’t worry. The plant is going to move its Nitrogen from the bottom to the tops. In approximately 10 days, the bottom fan leaves are going to turn yellow. That plant has plenty enough Nitrogen stocked. I would still recommend to take a sample from the drain of the pots and see if the EC is not too high.

Definitely get that RH down during lights off