Could this be a magnesium deficiency?

[frostfree]

https://www.icmag.com/ic/attachment.php?attachmentid=308066&stc=1&d=1426012426

 

[genedigger]

soil?hydro? organic or not?

 

[frostfree]

soil, but I screwed up and got the wrong stuff. Just trying to get through my 1st grow. Still learning.
Next grow is with fox farm ocean forrest!

 

[SandDog]

subbed.

 

[Midwest sticky]

Look here and compare
https://www.icmag.com/ic/showthread.php?t=231387

 

[Crusader Rabbit]

Your soil may have enough magnesium, but if the pH is off, the plants won't be able to access it.

 

[Cyklo]

Hope this helps:

http://www.thenug.com/galleries/diagnose-your-sick-marijuana-plants

 

[SmokeyTheBear]

It's the early signs of over fertilization.