Organic13 said:

What medium are they in?
Do you know the strain you are growing?
What are you feeding them and how much?
How often and how much are you watering?
Are the yellowing leaves, I can somewhat make out in the background, just old leaves or is something else going on?

Probably need a better look at the plants, as a whole, and a close up of the leaves you are trying to diagnose, maybe when it is daylight out?

I can't help you diagnose, but these answers/photos will help others diagnose for you.

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Week4Bytch said:

If it feels like paper probably potassium. My first guess was sulfur. That or your pH is way off in the medium.

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phillyguy said:

It looks much better than it did a few weeks before. I was under watering and it came back well. Do you top dress more often than once a month? Am I waaaaay over thinking all this? I am very prone to wory over nothing.

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