Hotwired
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The tips got burnt when I gave my girls a hot meal. I always give them one hot meal to see how they react. The one that burnt the tips was only 720 ppm. I gave them water only on the next feed and that took care of that. They got 620 ppm since and no problems except for this.Considering how high up on the plant it is, Id suspect a CA lockout. Since the tips are burnt I wouldnt suspect a deficiency. Likely a lockout of CA due to hot nutes. Try dialing back the nutes a bit and see if she starts to ease out of it.
Whats your feed/schedule with them?
I think I will give them water and Cal/mag next feed and see what happens