Problem, please help!

I have several plants in their 6th week of flowering and the leaves are yellowing all over. I noticed the beginnings of the yellowing and decided to use Clearex for 48 hours. Now 2 days after the Clearex, they are looking even worse. I upped the nutes from 680 before the Clearex and now 953 afte, which was probably too big a jump. Any thoughts?

Yo, 600 is pretty low for 6th week of flower. You are probably starting to see the beginning of a macro-nutrient deficiency.

Also, you know that plants leaves start dying off in late flower right?

Could be either one of these.

K

I don't know anything about feeding ppm but when you flush a plant that is already starving for N then you really creat a huge problem. Your nutes are carried around the plant via N. So now you can start to see the deficincies to show up in your plant, by giving it a big shot of N to make up for it you are feeding a hungry plant and easy to burn as a result.
A properly feed plant will retain most of it leaves and in a nice green color throughout the grow. Deficincies show up first normally in the bottom leaves and excesses in the up leaves. So in the future watching your bottom leaves can help regulate you N during flower and watching the new growth in the top for any nute burn.
Hope this helps and good luck to your girls.

yeah I would say around 900-1200 ppm for nutes 6 weeks flowering (depending on srain)..... Yellowing is normal the last couple weeks of flowering. You can do one week of a "vegg" nutrient (most vegg nutes usually have higher N in them) and then flush the last 1 1/2 weeks of 12/12. I personally use Jacks Classic Nutes, and when Im in flowering, I will use the vegg part every couple weeks or so to help keep everything green.