They are all yellow..

Hi guys, thank you for all your answers! I haven't measured the runoff but I did measure the water after adding the biobizz nutes, which was around 1.4 EC. So sorry, 0.4 is wrong. They are in 8 liter (2 gallon) fabric pots on a small tray, so any runoff would spill over to my tent. That's why I give around 1 liter (0.26 gallon) of water twice a week, so yes, there has never been a runoff. From your answers I understand I need to flush the soil now with lot of water, because, it might be toxic due to leftover salts. Thanks, will try and see what happens!

They are very hungry increase the dose to EC 1.8 also I can see PH fluctuation check your PH runoff and fix it 🤠😎

High, increase the Bloom and the Top Max both to 4ml per liter. You can also just google Biobizz nutrient schedule for the right amounts.

yellow climbing up from bottom and tip-in. .. N deficiency. if you want the plant to grow as well as you can, you provide the building blocks. No reason to taper off or stop unless there is a toxicity. The plant cannot function as well if you starve it. How that idea every became popular is crazy. Growth requires building materials, and it's moer efficient if they get them from the roots than have to take them from the leaves. Green leaves at harvest does not impact mineral content of flower... proven fact, not just blindly repeated nonsense that "sounds right." despite common belief, the plant needs nearly as much nitrogen, if not the same, in flower phase. it is absurd to ignore the fact that those that drop the concentration of N often get a N-deficiency, lol... it's like the lines from idiocracy about salting the earth, "But, it's what plants crave!" ... that's fine. Say it all you want, but the plant clearly needs more N than what "they" say ad nauseum in the face of clear contradicting evidence... .not unlike the 'end of harvest flush' reasoning... all the reasons they gave have been proven bogus.

If your diary is correct the 0.4EC is way to low. so yes they are very hungry. I'd bump that up to aorund 1.6-1.8 and make sure your giving them a good amount of runoff to prevent buildup in the medium. its weird as in some of the pics it looks like they where overfeed and have burnt tips. You will want to tapper the feeds off a bit when they are a few weeks out from harvest but still down to aorund 1EC or 0.8 nothing aorund 0.4 I have a feeling your medium is over saturated with leftover salts and this is part of the reason why its so drastic in colour. Good Luck!