Afghan Kush Ryder (Autoflower) Yellowing tips

6 Afghan Kush Ryder(Auto flower).The ladies are 4 weeks old and the tips of the leafs are starting to yellow, otherwise they are looking good. Bubbleponics DWC. They are 8 inches tall from seed. They are under 600w Hps 36 inches from top, on a 20/4 schedule. PPM is 800, I got my PPM meter when they were 2 1/2 weeks old and the initial reading was 1930 so I added 2 gallons of water to the reservoir. My PH has been a steady 6.0. , Temps range from 75 to 81 degrees F. Im guessing that they were over fertilized. What is the cause and how can I correct this???? Thanks in advance for any help or comments. Will post pictures later on today when I get my camera.

sounds like nute burn and nothing can be done except don't overfeed. Burnt tip wont harm the plant or yeild and some peeps use that as a guide to fine tune their nutes. They will slowly increase nutes until the tips just start to turn that yellow color and then they back of the nutes a little and thats where they stay.

Thanks tinytoon. I'm due for a reservoir change tomorrow, should I just not add nutes for a few days or just go easy them? I"ll be using Advanced Nutrients Bloom 2 part A and B.

stick with the normal feed plan, the tips wont get worst unless nute str gets to high again. as I said before what is done is done and cant be changed, its only the tips no big deal :thumbsup: