Quote Originally Posted by Newb1stTime
Oh, thanks for the link. It looks like a combination of P and K deficiency, but they get plenty. Must be a lockout, and I do not have anything to test PH with....dammit. I will flush and wait a few days. Thanks for your help. Yeah, I was a bit skeptical about the N deficiency because it started at the top and is working it's way all over the large fan leaves.
What is a good option if you dont have a pH meter (which you need)
get some additive maybe a sugar supplement like "Sweet" by General hydroponics. IT has pH buffers in it, so when u mix it up it's always around 6.4. And you can feed it with every watering.

Also, if you have synthetic nutes they also have buffers.

I like to pH my soil. or buy soil that i know the pH of. it avoids a lot of problems. pH is HUGE i cant stress that enough