Bottom fan leaves yellowing +more. Pics under week...

They look fine to me.discoloring bottom is ok and good.it show plant is moving efforts to flowers. Tops looking good. Becareful with furts ..to me it looks like too much in there.you are not far from harvest just keep it simple

Looking like a nite deficiency, you got some good answers so this is basically just repeating lol but flush good give it about 3x the amount of water you normally do let it cleanse our then wait until the pot is LIGHT like nothings in it then feed. Watch over watering though. No need to water until the pot is super light. Looking good though buddy! Good luck and keep growing! ✊🏻✌️🏻

You seem to have a good nute lineup. Can you maybe flush well to break up any buildup either with plain ph water, or add some sort of flushing agent like bushdoctor sledgehammer(or another variety) I think your yellowing would actually be down to roots or ph problems. The rest of the plants looking great though. Ooh also are you using RO water or tap? I know tap can have some of those micros that the bottled water lacks.

To me it’s definitely a mag deficiency with what looks like a bit of overwatering. But because they are in flower you should give them a mag/sulfer not a cal/mag. You’d be looking for something like Epsom salts.

I agree with @Athos, however I believe it to be nutrient deficiency caused by nutrient lockup. I would recommend flushing your plants for the next couple of feedings and then proceed with his recommendation. For the plant that is a significant amount of unessisary nutrients that you have added. Best of luck on your grow!

Here's my take on what's going on. Since you post no PPM/EC, I can't comment on your feeding strength. You should feed every 7 to 10 days, depending on how strong you feed. Now your are feeding lots of stuff: root stimulators, flavor enhancer, vitamins, but basic nutrients (grow or bloom) very little; will be back to this later. Second, you have two types of yellowing, the interveinal yellowing along with purple petioles are a clear sign of Mg deficiency. The more homogeneous yellowing is N deficiency. What I would do is have a simpler feeding regime: Cal-Mag, Grow and Bloom, forget the rest for now. Grow and Bloom feed 1 ml/lt each, as for Cal-mag use 2 ml/lt