Sounds like you kinda answered your own question.

You should check your PH regularly and i would suggest getting some better quality nutes as well, cuz schultz is like low quality miracle-gro and even that isnt the best for your plant.

Is the schultz all your using for ferts?
rysk8er420 Reviewed by rysk8er420 on . What would cause this? soil water pH 6.6 CFL's 30 days into flower 80 degrees 40% RH Just flushed this a few days ago Most fans did this. Plant looks like crap. Flowers are still looking fine though. Have never checked soil pH and I wonder if this might be the problem and it's locking out Mg and P as I've given it some epsom and high P ferts (Schultz Bloom fert 10-54-10) and all it did was continue to be a problem. It's either that or the next photo shows the problem. Isn't it supposed to be green? Rating: 5