Leaves yellowing

I do have a diary, purple lemonade auto. 6 weeks tomorrow. I always have a decent run-off & ph is generally around 6.5

What is happening is called a Die-Back, it happens around week 4-5 of flowering by the end of the stretch. The plant is moving its Nitrogen to save the tops. You must understand that at this stage of its life cycle the roots system doesn’t process Nitrogen anymore but only P and K, meaning adding Nitrogen will be useless. It mostly happens when the plant didn’t get enough Nitrogen during the stretch. Just let the plant do its job and don’t pull off the yellowing leaves.

Looks like you are not getting enough run off when you feed. 20 to 30 percent of what goes in needs to come out. Looks like a salt build up in substrate. What is run off ph and tds? More information we have the better to help diagnose it. This is why having a diary is very helpful.

CalMag... If the Leaves keep Clawing flush and half the feed dont give more since thats the most common problem. They might already have an imbalance due to the lack of CalMag uptake giving more nutes wont help only worsen the problem... They dont need more food! But the right balance that if kept, the plant uses to take up more nutes to grow faster. Its not a black hole you throw stuff in to get it bigger if that makes sense.

Me too i think she need more food and calmag 0.2mg is some I think biobiz have to give more than 0.2mg per liter

Increase the food. Plant looks starved

And 0.2mg of calmag per litre