One single plant giving me problems

I have 6 plants in a 4x4 tent with coco/perlite mix in Floraflex pots under ROI-e640 LED light on 40%. They have been doing great and I have started twice a day feedings and they have been loving it. Then plant #6 appeared darker than the rest but I figured it was just a phenotype characteristic as she looked great. But I went in and she was the only one with some minor nute burn. Gave her lower ppm “flush” and new growth appeared fine. Now couple days later she has weird light spots and major curling on top leaves. I thought may be light burn as I turned up to 60% day before. I have raised the light and no other plants show any signs of issues. Runoff ppm slightly lower than input and ph had been consistent 6.0 the whole run. The other plants are begging to be fed more, I just don’t want to over feed this one. I’m just confused at this point lol I don’t believe it’s pests but at this point I’m lost.

Any ideas?

What are you feeding and how much? Are you positive of your pH and have you considered lowering it? What are you doing for Mg and Ca?

If I had to give just one guess...pH.

Just weird that one plant would have PH issues. Ph is checked/adjusted every feeding. I’m using veg+bloom nutrients with their stackswell cal+mag and “life” additive. I have not considered lowering it as of yet.

I have slowly raised it to about .8 ec and want to keep raising as the other plants are hungry for more but Hesitated because I thought I was over feeding this one

I totally follow your logic...if one, why not the others? Maybe it's just a bad seed...or?

I would consider adjusting your pH down to 5.8 and see if there's improvement. And be sure your probe is working correctly, ie it's calibrated. Otherwise, I got nothin'. Wish I could be more help. Good luck

I will give that a shot, like you said, maybe just that particular seed/pheno. Thanks for feedback!